Acrobat Ant
Crematogaster spp.
Acrobat ants (Crematogaster species) are small light-brown to black ants named for raising their heart-shaped abdomen …
Type what you see — a name, a description like “tiny brown bug”, or a sign like “droppings” — and we’ll find the match. Every profile covers identification, habitat, breeding, diet, signs, prevention, health & safety and control.
303 pests in the field guide
Crematogaster spp.
Acrobat ants (Crematogaster species) are small light-brown to black ants named for raising their heart-shaped abdomen …
Hypera postica
The alfalfa weevil (Hypera postica) is a small brown weevil whose green, white-striped larvae are the main pest stage,…
Periplaneta americana
The American cockroach (Periplaneta americana) is the largest common US house roach, reddish-brown with a pale yellow …
Dermacentor variabilis
The American dog tick (Dermacentor variabilis) is a brown tick with off-white mottled markings, common east of the Roc…
Sitotroga cerealella
The Angoumois grain moth (Sitotroga cerealella) is a small buff-yellow moth whose larvae develop entirely inside whole…
Neotibicen spp.
Annual or dog-day cicadas (Neotibicen species) are large green-and-black insects that appear every summer across the U…
Linepithema humile
The Argentine ant (Linepithema humile) is a small light-to-dark brown ant that forms enormous supercolonies with many …
Centruroides sculpturatus
The Arizona bark scorpion (Centruroides sculpturatus) is a small, pale tan desert scorpion and the most venomous scorp…
Harmonia axyridis
The Asian lady beetle (Harmonia axyridis) is an orange-to-red domed beetle with a variable number of spots and a black…
Anoplophora glabripennis
The Asian longhorned beetle (Anoplophora glabripennis) is a large, glossy black beetle with white spots and long black…
Aedes albopictus
The Asian tiger mosquito (Aedes albopictus) is a small black-and-white striped mosquito that bites aggressively during…
Crioceris asparagi
The common asparagus beetle (Crioceris asparagi) is a small, metallic blue-black beetle with cream spots and red margi…
Macrosteles quadrilineatus
The aster leafhopper (Macrosteles quadrilineatus) is a small green, wedge-shaped insect that sucks plant sap and, more…
Stephanitis pyrioides
The azalea lace bug (Stephanitis pyrioides) is a tiny insect with clear, lacy wings that feeds on the underside of aza…
Thyridopteryx ephemeraeformis
The bagworm (Thyridopteryx ephemeraeformis) is a moth caterpillar that builds and lives inside a spindle-shaped bag wo…
Dolichovespula maculata
The bald-faced hornet (Dolichovespula maculata) is a large black-and-white wasp, actually a type of yellowjacket, that…
Adelges piceae
The balsam woolly adelgid (Adelges piceae) is a tiny invasive sap-feeding insect that attacks true firs like balsam an…
Cimex adjunctus
The bat bug (Cimex species) is a small, flat, reddish-brown insect nearly identical to the bed bug that normally feeds…
Cerotoma trifurcata
The bean leaf beetle (Cerotoma trifurcata) is a small, variable reddish-to-yellow beetle with black spots and a black …
Acanthoscelides obtectus
The bean weevil (Acanthoscelides obtectus) is a small, oval, mottled gray-brown seed beetle whose short snout sets it …
Cimex lectularius
Bed bugs (Cimex lectularius) are small, flat, reddish-brown insects about the size of an apple seed that feed on human…
Spodoptera exigua
The beet armyworm (Spodoptera exigua) is a smooth green caterpillar with pale side stripes that feeds on a wide range …
Circulifer tenellus
The beet leafhopper (Circulifer tenellus) is a small, pale, wedge-shaped insect of the arid western US that hops and f…
Eptesicus fuscus
The big brown bat (Eptesicus fuscus) is one of the most widespread US bats, a sturdy brown insect-eater larger than th…
Sphenophorus spp.
Billbugs are small weevils with a long snout whose white, legless grubs feed inside grass stems and on roots. Damaged …
Fenusa pusilla
The birch leafminer (Fenusa pusilla) is the larva of a small non-stinging sawfly introduced from Europe. Larvae tunnel…
Dermanyssus gallinae / Ornithonyssus spp.
Bird mites (Dermanyssus gallinae and Ornithonyssus species) are nearly microscopic parasites of birds. When nestlings …
Culicoides spp. (Ceratopogonidae)
Biting midges (Culicoides species), often called no-see-ums or sand flies, are gnat-sized flies with a painful, itchy …
Attagenus unicolor
The black carpet beetle (Attagenus unicolor) is a small, shiny black oval beetle and one of the most common fabric pes…
Simulium spp. (Simuliidae)
Black flies (family Simuliidae) are tiny, humpbacked biting flies also called buffalo gnats. Females bite around the h…
Hermetia illucens
The black soldier fly (Hermetia illucens) is a large, harmless black fly whose larvae are prized decomposers in compos…
Otiorhynchus sulcatus
The black vine weevil (Otiorhynchus sulcatus) is a flightless black beetle whose adults notch the leaf edges of rhodod…
Latrodectus spp.
Black widows (Latrodectus species) are glossy black spiders with a red hourglass mark on the underside of the abdomen.…
Ixodes scapularis
The blacklegged or deer tick (Ixodes scapularis) is a small reddish-brown tick with dark legs and the main carrier of …
Epicauta spp.
Blister beetles (Epicauta species) are elongated, soft-bodied beetles with a narrow 'neck' that feed in groups on gard…
Calliphoridae (Lucilia, Calliphora spp.)
Blow flies (family Calliphoridae) are metallic blue, green, or bronze flies slightly larger than a house fly. Attracte…
Pediculus humanus humanus
The body louse (Pediculus humanus humanus) lives and lays eggs in the seams of clothing and bedding, moving to the ski…
Anthonomus grandis
The boll weevil (Anthonomus grandis) is a small gray-brown weevil with a long snout that attacks cotton, feeding on an…
Liposcelis spp.
Booklice, or psocids (Liposcelis species), are tiny, soft-bodied, pale insects about 1 mm long, often mistaken for dus…
Cydalima perspectalis
The box tree moth (Cydalima perspectalis) is an invasive pest whose green, black-striped caterpillars feed only on box…
Boisea trivittata
The boxelder bug (Boisea trivittata) is a black, elongated bug with three orange-red stripes behind its head and red-e…
Monarthropalpus flavus
The boxwood leafminer (Monarthropalpus flavus) is a small orange gall midge whose larvae tunnel inside boxwood leaves,…
Cacopsylla busi
The boxwood psyllid (Cacopsylla busi) is a small greenish, aphid-like jumping insect whose nymphs suck sap from new bo…
Agrilus anxius
The bronze birch borer (Agrilus anxius) is a native flatheaded beetle whose larvae tunnel under the bark of birch tree…
Rhipicephalus sanguineus
The brown dog tick (Rhipicephalus sanguineus) is a reddish-brown tick unique for completing its entire life cycle indo…
Cornu aspersum
The brown garden snail (Cornu aspersum) is a round-shelled land snail that feeds at night on leaves, seedlings, and fr…
Halyomorpha halys
The brown marmorated stink bug (Halyomorpha halys) is a shield-shaped, mottled-brown insect with white bands on its an…
Loxosceles reclusa
The brown recluse (Loxosceles reclusa) is a light-brown spider with a dark violin-shaped mark behind its head and six …
Latrodectus geometricus
The brown widow (Latrodectus geometricus) is a relative of the black widow, mottled tan to brown with an orange hourgl…
Supella longipalpa
The brown-banded cockroach (Supella longipalpa) is a small tan roach with two lighter bands across its wings and body.…
Bombus spp.
Bumblebees (Bombus species) are large, round, fuzzy black-and-yellow bees and important native pollinators. They nest …
Brevicoryne brassicae
The cabbage aphid (Brevicoryne brassicae) is a small gray-green aphid coated in waxy powder that infests cole crops li…
Trichoplusia ni
The cabbage looper (Trichoplusia ni) is a smooth green caterpillar that arches its body into a loop as it crawls. It c…
Delia radicum
The cabbage maggot (Delia radicum) is the larva of a small gray fly that tunnels into the roots of cabbage, broccoli, …
Ceuthophilus spp.
Camel crickets (Ceuthophilus species) are humpbacked, wingless crickets with long legs and antennae that jump when sta…
Branta canadensis
The Canada goose (Branta canadensis) is a large waterfowl with a black head and neck, a white chinstrap, and a brown b…
Alsophila pometaria (fall); Paleacrita vernata (spring)
Cankerworms are the looping inchworm caterpillars of two native moths, the fall cankerworm (Alsophila pometaria) and s…
Camponotus spp.
Carpenter ants (Camponotus species) are among the largest US ants, usually black or red and black. They don't eat wood…
Xylocopa virginica
Carpenter bees (Xylocopa species) are large, robust bees that look like bumblebees but have a shiny, hairless black ab…
Chamaepsila rosae
The carrot rust fly (Chamaepsila rosae) is a small, shiny black fly whose creamy maggots tunnel into carrots and relat…
Tinea pellionella
The casemaking clothes moth (Tinea pellionella) is a small brownish moth with faint dark wing spots whose larva carrie…
Ctenocephalides felis
The cat flea (Ctenocephalides felis) is the tiny, reddish-brown, wingless insect behind most flea problems on US cats …
Family Pholcidae
Cellar spiders (family Pholcidae), often called daddy long-legs spiders, are pale spiders with tiny bodies and very lo…
Eutrombicula alfreddugesi
Chiggers are the tiny larvae of harvest mites (Eutrombicula alfreddugesi) found in grassy, brushy, and wooded areas. T…
Blissus spp.
Chinch bugs (Blissus species) are tiny black-and-white insects that suck sap from grasses, injecting a toxin that brow…
Sphecius speciosus
The eastern cicada killer (Sphecius speciosus) is a huge solitary wasp up to two inches long, reddish-brown with yello…
Lasioderma serricorne
The cigarette beetle (Lasioderma serricorne) is a tiny, reddish-brown, hump-backed beetle that infests stored tobacco …
Family Elateridae
Click beetles (family Elateridae) are elongate, hard-bodied brown or black beetles famous for the clicking snap they u…
Bryobia praetiosa
Clover mites (Bryobia praetiosa) are tiny reddish-brown plant-feeding mites that invade homes in large numbers during …
Pollenia spp.
The cluster fly (Pollenia species) is a sluggish, dark-gray fly slightly larger than a house fly, with golden hairs on…
Cydia pomonella
The codling moth (Cydia pomonella) is a small gray moth with a coppery patch at each wingtip and the classic 'worm in …
Leptinotarsa decemlineata
The Colorado potato beetle (Leptinotarsa decemlineata) is a round, yellow-orange beetle with ten black stripes that fe…
Phytomyza aquilegivora
The columbine leafminer (Phytomyza aquilegivora) is a tiny black fly whose larvae tunnel inside columbine leaves, leav…
Thamnophis sirtalis
The common garter snake (Thamnophis sirtalis) is a slender, harmless snake with long yellow stripes down a dark body. …
Parasteatoda tepidariorum
The common house spider (Parasteatoda tepidariorum) is a small yellow-brown spider that builds messy, tangled cobwebs …
Tribolium confusum
The confused flour beetle (Tribolium confusum) is a tiny, shiny reddish-brown pantry pest nearly identical to the red …
Agkistrodon contortrix
The copperhead (Agkistrodon contortrix) is a venomous pit viper with a coppery head and dark, hourglass-shaped crossba…
Helicoverpa zea
The corn earworm (Helicoverpa zea) is a striped caterpillar that is one of the most damaging US crop pests. The larva …
Diabrotica spp.
Corn rootworms (Diabrotica species) are among the costliest US corn pests, often called the 'billion-dollar bug.' The …
Sigmodon hispidus
The hispid cotton rat (Sigmodon hispidus) is a stocky, coarse-furred rodent of the southern US, grizzled gray-brown ab…
Icerya purchasi
Cottony cushion scale (Icerya purchasi) is a soft scale insect famous for the large, white, fluted cottony egg sac the…
Pulvinaria innumerabilis
Cottony maple scale (Pulvinaria innumerabilis) is a soft scale best known for the white, cottony egg masses females de…
Canis latrans
The coyote (Canis latrans) is an adaptable, dog-like wild canid, grayish-brown with pointed ears and a bushy, low-hang…
Tipula spp. (Tipulidae)
Crane flies (family Tipulidae) are large, slow, long-legged insects that look like giant mosquitoes but do not bite or…
Evergestis rimosalis
The cross-striped cabbageworm (Evergestis rimosalis) is a caterpillar of cole crops, bluish-gray on top with many blac…
Noctuidae (Agrotis spp. and others)
Cutworms are plump, gray-brown caterpillars, the larvae of night-flying moths, that hide in soil by day and cut down y…
Phytonemus pallidus
The cyclamen mite (Phytonemus pallidus) is a microscopic mite that infests strawberries, cyclamen, African violets, an…
Zootermopsis spp.
Dampwood termites (Zootermopsis species) are the largest termites in the US and live only in wood with high moisture, …
Chrysops spp. (Tabanidae)
Deer flies (Chrysops species) are medium-sized biting flies with patterned wings and bright eyes. Females deliver a pa…
Peromyscus maniculatus
The deer mouse (Peromyscus maniculatus) is a small, big-eyed rodent with brown fur and a sharply two-toned white belly…
Plutella xylostella
The diamondback moth (Plutella xylostella) is a small gray-brown moth whose slender green caterpillars chew holes and …
Ctenocephalides canis
The dog flea (Ctenocephalides canis) is a tiny, wingless, reddish-brown insect that jumps onto dogs and other mammals …
Synanthedon scitula
The dogwood borer (Synanthedon scitula) is a clearwing moth whose larvae tunnel beneath the bark of flowering dogwood …
Clogmia and Psychoda spp.
The drain fly (family Psychodidae) is a tiny, fuzzy, moth-like fly, also called a moth fly or sewer fly, that breeds i…
Stegobium paniceum
The drugstore beetle (Stegobium paniceum) is a tiny, reddish-brown, hump-backed beetle that eats an exceptionally wide…
Incisitermes spp.
Drywood termites (Incisitermes species) live entirely inside dry, sound wood with no contact with soil, so they build …
Tamias striatus
The eastern chipmunk (Tamias striatus) is a small, striped ground squirrel with reddish-brown fur, dark and light back…
Sylvilagus floridanus
The eastern cottontail (Sylvilagus floridanus) is a common brown wild rabbit with a fluffy white tail. A prolific bree…
Sciurus carolinensis
The eastern gray squirrel (Sciurus carolinensis) is a familiar tree squirrel with gray fur, a white belly, and a large…
Scalopus aquaticus
The eastern mole (Scalopus aquaticus) is a small, burrowing insectivore, not a rodent, with velvety gray fur, huge pad…
Malacosoma americanum
The eastern tent caterpillar (Malacosoma americanum) builds silken tents in the forks of cherry, apple, and crabapple …
Xanthogaleruca luteola
The elm leaf beetle (Xanthogaleruca luteola) is a small yellow-green beetle with a black stripe along each wing cover.…
Arocatus melanocephalus
The elm seed bug (Arocatus melanocephalus) is a dark, rusty-marked true bug from Europe that invades homes in summer, …
Agrilus planipennis
The emerald ash borer (Agrilus planipennis) is an invasive metallic-green beetle from Asia whose larvae tunnel beneath…
Unaspis euonymi
Euonymus scale (Unaspis euonymi) is an armored scale that heavily infests euonymus, pachysandra, and holly. The female…
Ostrinia nubilalis
The European corn borer (Ostrinia nubilalis) is a pale, spotted caterpillar that tunnels into corn stalks, ears, and o…
Tipula paludosa
The European crane fly (Tipula paludosa) is a large, long-legged fly that looks like a giant mosquito but does not bit…
Forficula auricularia
The European earwig (Forficula auricularia) is a slender, reddish-brown insect easily recognized by the pincer-like fo…
Vespa crabro
The European hornet (Vespa crabro) is the only true hornet in North America, a large brown-and-yellow wasp up to 1.5 i…
Sturnus vulgaris
The European starling (Sturnus vulgaris) is a stocky, glossy black bird speckled with white in winter, with a yellow b…
Musca autumnalis
Face flies (Musca autumnalis) resemble house flies and gather around the eyes, nose, and mouth of cattle and horses to…
Spodoptera frugiperda
The fall armyworm (Spodoptera frugiperda) is a striped caterpillar marked by an inverted white 'Y' on its head. Larvae…
Hyphantria cunea
The fall webworm (Hyphantria cunea) is a native caterpillar that spins large silken webs over the ends of tree branche…
Columba livia
The feral pigeon (Columba livia) is the common gray city pigeon, with an iridescent green-purple neck and two dark win…
Formica spp.
Field ants (Formica species) are medium-to-large outdoor ants, black, brown, or reddish, often mistaken for carpenter …
Gryllus spp.
The field cricket (Gryllus species) is a shiny black cricket up to an inch long with a loud, familiar chirp. It lives …
Thermobia domestica
The firebrat (Thermobia domestica) is a mottled gray-brown, wingless insect closely related to the silverfish, but it …
Dolomedes spp.
The fishing spider (Dolomedes species) is a large brown, mottled spider that lives near ponds and streams, where it ca…
Chrysomelidae (Phyllotreta, Epitrix, and others)
Flea beetles are tiny, dark, jumping beetles that chew small round 'shot-hole' pits in the leaves of many vegetables. …
Sarcophaga spp. (Sarcophagidae)
Flesh flies (Sarcophaga species) are gray flies with three dark stripes on the thorax and a checkerboard-patterned abd…
Glaucomys spp.
Flying squirrels (Glaucomys species) are small, nocturnal squirrels with soft gray-brown fur, huge dark eyes, and a lo…
Ahasverus advena
The foreign grain beetle (Ahasverus advena) is a tiny reddish-brown beetle that feeds on mold, not grain itself. It ap…
Malacosoma disstria
The forest tent caterpillar (Malacosoma disstria) is a native caterpillar that feeds on hardwood leaves in spring and,…
Coptotermes formosanus
The Formosan subterranean termite (Coptotermes formosanus) is the most destructive termite in the US. Its colonies can…
Poecilocapsus lineatus
The four-lined plant bug (Poecilocapsus lineatus) is a bright yellow-green true bug marked with four black stripes dow…
Drosophila melanogaster
The fruit fly (Drosophila melanogaster) is a tiny tan fly about 1/8 inch long, usually with bright red eyes, that swar…
Bradysia spp. (Sciaridae)
Fungus gnats (Bradysia species) are tiny, delicate, dark flies that hover around houseplants and damp soil. The adults…
Deroceras reticulatum
Garden slugs are soft, slimy, shell-less mollusks that feed at night on leaves, seedlings, and ripening fruit, leaving…
Blattella germanica
The German cockroach (Blattella germanica) is a small, tan indoor roach marked by two dark stripes behind its head. It…
Tapinoma melanocephalum
The ghost ant (Tapinoma melanocephalum) is a tiny ant with a dark head and thorax but pale, almost translucent legs an…
Thrips simplex
The gladiolus thrips (Thrips simplex) is a slender, dark insect under 2 mm that rasps sap from gladiolus and iris leav…
Acarus siro
The grain mite (Acarus siro) is a microscopic, pale, soft-bodied mite that thrives in damp stored grain, flour, and ch…
Sitophilus granarius
The granary weevil (Sitophilus granarius) is a shiny reddish-brown to black weevil with a long snout and no wing spots…
Agelenopsis spp.
Grass spiders (Agelenopsis species) are fast brown funnel-weavers that build sheet-like webs with a funnel retreat in …
Acrididae (Melanoplus spp. and others)
Grasshoppers are familiar jumping insects with big hind legs and short antennae that chew the leaves of garden plants,…
Myzus persicae
The green peach aphid (Myzus persicae) is a tiny, soft-bodied pale-green insect that clusters on leaves and stems, suc…
Family Carabidae
Ground beetles (family Carabidae) are fast-running, dark, often shiny beetles with ridged wing covers that hide under …
Otospermophilus spp.
Ground squirrels (Otospermophilus and related genera) are burrowing rodents of the western and central US, mottled gra…
Marmota monax
The groundhog (Marmota monax), or woodchuck, is a stocky, brown ground squirrel about the size of a large cat. This bu…
Amblyomma maculatum
The Gulf Coast tick (Amblyomma maculatum) is a brown, silvery-marked tick of coastal prairies and the Southeast. Adult…
Blissus leucopterus hirtus
The hairy chinch bug (Blissus leucopterus hirtus) is a tiny black-and-white true bug that damages lawns across the Nor…
Murgantia histrionica
The harlequin bug (Murgantia histrionica) is a small, shield-shaped stink bug boldly patterned in black, red, and oran…
Opiliones (order)
The harvestman (order Opiliones), or daddy-longlegs, is a round-bodied arachnid with long legs that is not a spider. I…
Pediculus humanus capitis
The head louse (Pediculus humanus capitis) is a tiny, wingless insect that lives on the human scalp and feeds on blood…
Adelges tsugae
The hemlock woolly adelgid (Adelges tsugae) is a tiny aphid-like insect that attacks eastern and Carolina hemlock tree…
Dermestes maculatus
The hide beetle (Dermestes maculatus) is a dark, oval dermestid beetle that feeds on dried animal matter: hides, leath…
Eratigena agrestis
The hobo spider (Eratigena agrestis) is a brown funnel-web spider found in the Pacific Northwest and inland Northwest.…
Phytomyza ilicicola
The holly leafminer (Phytomyza ilicicola) is a tiny black fly whose larvae tunnel inside holly leaves, leaving yellow …
Apis mellifera
The honey bee (Apis mellifera) is a golden-brown, fuzzy pollinator that lives in large perennial colonies and is vital…
Haematobia irritans
Horn flies (Haematobia irritans) are small blood-feeding flies about half the size of a house fly that cluster on the …
Tabanus spp. (Tabanidae)
Horse flies (Tabanus species) are large, stout, fast-flying flies with big iridescent eyes. Only females bite, slicing…
Scutigera coleoptrata
The house centipede (Scutigera coleoptrata) is a fast, grayish-yellow arthropod with 15 pairs of very long legs. It hu…
Acheta domesticus
The house cricket (Acheta domesticus) is a light yellowish-brown cricket about 3/4 inch long, known for the loud chirp…
Dermatophagoides farinae
House dust mites (Dermatophagoides farinae and D. pteronyssinus) are microscopic arachnids that live in bedding, uphol…
Musca domestica
The house fly (Musca domestica) is a dull-gray fly about 1/4 inch long, with four dark stripes on its back and spongin…
Mus musculus
The house mouse (Mus musculus) is a small gray-brown rodent with large ears, a pointed snout, and a long tail. It sque…
Passer domesticus
The house sparrow (Passer domesticus) is a small, stout brown bird; males have a gray crown and black bib. This non-na…
Pulex irritans
The human flea (Pulex irritans) is a small, dark, laterally flattened insect that jumps and feeds on the blood of peop…
Pieris rapae
The imported cabbageworm (Pieris rapae) is the velvety green caterpillar of the common white cabbage butterfly. It che…
Plodia interpunctella
The Indianmeal moth (Plodia interpunctella) is the most common pantry moth, recognized by forewings that are pale gray…
Ips spp.
Ips beetles (Ips species), also called engraver beetles, are small bark beetles that tunnel Y- or I-shaped galleries u…
Macronoctua onusta
The iris borer (Macronoctua onusta) is the caterpillar of a night-flying moth and the most destructive pest of iris. Y…
Popillia japonica
The Japanese beetle (Popillia japonica) is a metallic green-and-copper beetle that swarms and skeletonizes the leaves …
Stenopelmatus spp.
The Jerusalem cricket (Stenopelmatus species), or potato bug, is a large, flightless, amber-brown insect with a bulbou…
Trichonephila clavata
The Joro spider (Trichonephila clavata) is a large, brightly colored orb-weaver from East Asia now spreading through t…
Family Salticidae
Jumping spiders (family Salticidae) are small, compact, often fuzzy spiders famous for their large forward-facing eyes…
Amynthas spp.
Jumping worms (Amynthas species) are invasive Asian earthworms that thrash wildly like a snake when handled. They live…
Phyllophaga spp.
June beetles (Phyllophaga species), also called May beetles or June bugs, are robust reddish-brown to black scarab bee…
Trogoderma granarium
The khapra beetle (Trogoderma granarium) is one of the world's most destructive stored-grain pests and a federally reg…
Triatoma spp.
Kissing bugs (Triatoma species) are large, dark, cone-headed insects, often edged with red or orange, that feed on blo…
Megacopta cribraria
The kudzu bug (Megacopta cribraria) is a small, olive-green, boxy true bug from Asia, first found in the US in Georgia…
Dermestes lardarius
The larder beetle (Dermestes lardarius) is a dark, elongate beetle with a pale band across its wing covers. It infests…
Leptoglossus spp.
Leaffooted bugs (Leptoglossus species) are large brown true bugs named for the flattened, leaf-like flares on their hi…
Cicadellidae spp.
Leafhoppers are small, wedge-shaped insects, roughly 1/8 to 1/2 inch, that hop or run sideways and suck sap from leave…
Monomorium minimum
The little black ant (Monomorium minimum) is a tiny, shiny black ant native to North America. Its colonies hold many q…
Myotis lucifugus
The little brown bat (Myotis lucifugus) is a tiny, glossy-brown insect-eating bat weighing only a few grams. Beneficia…
Amblyomma americanum
The lone star tick (Amblyomma americanum) is an aggressive, fast-biting tick named for the single white dot on the fem…
Neolecanium cornuparvum
Magnolia scale (Neolecanium cornuparvum) is one of the largest soft scales in the US, reaching about half an inch. The…
Sitophilus zeamais
The maize weevil (Sitophilus zeamais) is a small reddish-brown weevil with a long snout and four orange-red spots on i…
Anopheles spp.
Malaria mosquitoes (Anopheles species) are the mosquitoes that can carry malaria. They rest with the abdomen tilted up…
Reduvius personatus
The masked hunter (Reduvius personatus) is a shiny black assassin bug whose young camouflage in dust and lint. A benef…
Microtus pennsylvanicus
The meadow vole (Microtus pennsylvanicus) is a small, stout rodent with a blunt snout, tiny ears, and a short tail, of…
Pseudococcidae spp.
Mealybugs are small, soft, oval insects covered in a white, cottony wax that makes them look like specks of fluff on s…
Ephestia kuehniella
The Mediterranean flour moth (Ephestia kuehniella) is a pale gray moth with wavy black lines across its forewings, and…
Oryzaephilus mercator
The merchant grain beetle (Oryzaephilus mercator) is a tiny, flat, dark-brown beetle with six sawtooth-like projection…
Epilachna varivestis
The Mexican bean beetle (Epilachna varivestis) is a copper-colored, spotted relative of the ladybug, but unlike helpfu…
Diplopoda
Millipedes are slow, cylindrical, many-segmented arthropods with two pairs of legs per segment that curl into a spiral…
Homadaula anisocentra
The mimosa webworm (Homadaula anisocentra) is a small gray-brown caterpillar that binds mimosa and honeylocust foliage…
Tyrophagus putrescentiae
Mold mites (Tyrophagus and related species) are microscopic, whitish-tan mites that swarm over damp, moldy surfaces an…
Neoscapteriscus spp.
Mole crickets (Neoscapteriscus species) are brown, inch-long insects with shovel-like front legs built for digging. Th…
Anabrus simplex
The Mormon cricket (Anabrus simplex) is a large, flightless shieldbacked katydid of the western US, not a true cricket…
Dendroctonus ponderosae
The mountain pine beetle (Dendroctonus ponderosae) is a small bark beetle native to western North America and the regi…
Sceliphron caementarium
Mud daubers (Sceliphron and related genera) are slender, thread-waisted solitary wasps, often black or metallic blue, …
Ondatra zibethicus
The muskrat (Ondatra zibethicus) is a large, semiaquatic rodent with dense brown fur, partly webbed hind feet, and a l…
Rhyacionia frustrana
The Nantucket pine tip moth (Rhyacionia frustrana) is a small moth whose larvae bore into the tips and buds of young p…
Dasypus novemcinctus
The nine-banded armadillo (Dasypus novemcinctus) is a cat-sized mammal covered in a bony, banded shell, with a long sn…
Culex pipiens
The northern house mosquito (Culex pipiens) is a small brown biting fly and the primary US carrier of West Nile virus.…
Rattus norvegicus
The Norway rat (Rattus norvegicus) is a large, stocky brown rodent with a blunt nose, small ears, and a tail shorter t…
Myocastor coypus
The nutria (Myocastor coypus) is a large, invasive semi-aquatic rodent with bright orange front teeth, a round rat-lik…
Family Cynipidae (Callirhytis, Amphibolips spp.)
Oak gall wasps (family Cynipidae) are tiny wasps whose feeding chemicals make oak trees grow galls, abnormal woody or …
Tapinoma sessile
The odorous house ant (Tapinoma sessile) is a tiny brown-black ant named for the rotten-coconut smell it gives off whe…
Aphis nerii
The oleander aphid (Aphis nerii) is a bright yellow, black-legged aphid that swarms oleander and milkweed in dense clu…
Delia antiqua
The onion maggot (Delia antiqua) is the larva of a small gray fly that bores into onion, garlic, and leek bulbs and ro…
Thrips tabaci
Onion thrips (Thrips tabaci) are tiny, slender pale-yellow to brown insects that rasp onion, garlic, and cabbage leave…
Anisota senatoria
The orangestriped oakworm (Anisota senatoria) is a caterpillar that feeds in groups on oak leaves in late summer, some…
Family Araneidae
Orb-weavers (family Araneidae) are the spiders that spin the classic round, wheel-shaped webs across doorways, gardens…
Blatta orientalis
The Oriental cockroach (Blatta orientalis) is a large, dark brown to shiny black roach often called a water bug. It pr…
Lepidosaphes ulmi
Oystershell scale (Lepidosaphes ulmi) is an armored scale whose tiny brown covers look like miniature oyster shells ce…
Neotoma spp.
The pack rat, or woodrat (Neotoma species), is a medium rodent with soft fur, big eyes and ears, and often a furry tai…
Polistes spp.
Paper wasps (Polistes species) are slender, long-legged wasps that build open, umbrella-shaped nests under eaves, rail…
Tetramorium immigrans
The pavement ant (Tetramorium immigrans) is a small dark brown to black ant that nests under sidewalks, driveways, and…
Synanthedon exitiosa
The peachtree borer (Synanthedon exitiosa) is a clearwing moth whose larvae bore into the lower trunk, crown, and root…
Parcoblatta pennsylvanica
The Pennsylvania wood cockroach (Parcoblatta pennsylvanica) is a native outdoor roach that lives under bark, logs, and…
Anthonomus eugenii
The pepper weevil (Anthonomus eugenii) is a tiny dark beetle with a long curved snout that attacks peppers and related…
Magicicada spp.
Periodical cicadas (Magicicada species) are black, red-eyed insects that emerge in massive synchronized broods every 1…
Monomorium pharaonis
The pharaoh ant (Monomorium pharaonis) is a tiny yellowish to light-brown ant that nests indoors in warm, humid voids.…
Megaselia scalaris (Phoridae)
Phorid flies (Megaselia scalaris and relatives) are tiny humpbacked flies that run in quick, erratic bursts rather tha…
Diaphania nitidalis
The pickleworm (Diaphania nitidalis) is the caterpillar of a night-flying moth that bores into the blossoms and fruit …
Armadillidium vulgare
The pillbug, or roly-poly (Armadillidium vulgare), is a small, gray, armored land crustacean, not an insect, that roll…
Neodiprion spp.
Pine sawflies (Neodiprion species) are wasp relatives whose caterpillar-like larvae feed in groups on pine needles, so…
Latridiidae spp.
Plaster beetles (family Latridiidae) are minute brown beetles that feed on mold and mildew in damp buildings, often sw…
Thomomys / Geomys spp.
Pocket gophers (family Geomyidae) are stocky, burrowing rodents with strong claws, big front teeth, and fur-lined chee…
Empoasca fabae
The potato leafhopper (Empoasca fabae) is a tiny, bright green, wedge-shaped insect that sucks sap from potatoes, bean…
Bactericera cockerelli
The potato psyllid (Bactericera cockerelli) is a tiny cicada-like insect whose nymphs feed on potatoes, tomatoes, pepp…
Lyctus spp.
Powderpost beetles (Lyctus and related genera) are small, reddish-brown to black wood-boring beetles whose larvae redu…
Procyon lotor
The raccoon (Procyon lotor) is a stocky, gray-brown mammal with a black facial mask and a bushy, ringed tail. This cle…
Pantherophis spp.
Rat snakes (Pantherophis species) are large, non-venomous constrictors that are excellent climbers and superb rodent h…
Tribolium castaneum
The red flour beetle (Tribolium castaneum) is a tiny, shiny reddish-brown beetle and a leading pest of flour, cereal, …
Solenopsis invicta
The red imported fire ant (Solenopsis invicta) is an aggressive reddish-brown ant that builds dome-shaped dirt mounds …
Sitophilus oryzae
The rice weevil (Sitophilus oryzae) is a small reddish-brown to black weevil with a long snout and four faint pale spo…
Dermacentor andersoni
The Rocky Mountain wood tick (Dermacentor andersoni) is a brown, ornately marked tick of the Mountain West and higher …
Ornithonyssus bacoti
Rodent mites (Ornithonyssus bacoti and related species) are tiny blood-feeding mites that live in rat and mouse nests.…
Rattus rattus
The roof rat (Rattus rattus) is a sleek, agile climbing rat with a pointed nose, large ears, and a tail longer than it…
Macrosiphum rosae
The rose aphid (Macrosiphum rosae) is a soft, pear-shaped insect, green or pinkish, that clusters on rose buds and ten…
Macrodactylus subspinosus
The rose chafer (Macrodactylus subspinosus) is a slender tan beetle with long, spiny reddish legs that swarms roses, g…
Dasineura rhodophaga
The rose midge (Dasineura rhodophaga) is a nearly invisible fly, under 1 mm, whose maggots feed inside rose buds and s…
Endelomyia aethiops
Rose sawflies, whose larvae are known as roseslugs, are caterpillar-like insects that skeletonize rose leaves, leaving…
Diaspidiotus perniciosus
San Jose scale (Diaspidiotus perniciosus) is a tiny armored scale, barely 2 mm, that encrusts the bark of fruit and or…
Oryzaephilus surinamensis
The sawtoothed grain beetle (Oryzaephilus surinamensis) is a tiny, flat, dark-brown beetle named for the six tooth-lik…
Sarcoptes scabiei
The scabies mite (Sarcoptes scabiei var. hominis) is a microscopic mite that burrows into the top layer of human skin …
Coccoidea spp.
Scale insects are small sap-feeders that look like tiny bumps or shell-like crusts stuck to stems, leaves, and bark ra…
Delia platura
The seedcorn maggot (Delia platura) is the small white larva of a fly that burrows into germinating seeds and seedling…
Lepisma saccharina
The silverfish (Lepisma saccharina) is a wingless, silvery-gray insect with a tapered, carrot-shaped body and a fish-l…
Scolytus multistriatus
The smaller European elm bark beetle (Scolytus multistriatus) is a small reddish-brown beetle that bores under elm bar…
Periplaneta fuliginosa
The smokybrown cockroach (Periplaneta fuliginosa) is a large, glossy mahogany-brown roach common in the humid Southeas…
Crambinae spp.
Sod webworms are the caterpillars of small buff-colored lawn moths. They live in silk-lined tunnels in the thatch and …
Dendroctonus frontalis
The southern pine beetle (Dendroctonus frontalis) is a tiny bark beetle that is the most destructive pine pest in the …
Oligonychus ilicis
The southern red mite (Oligonychus ilicis) is a spider mite that attacks broadleaf evergreens like azalea, camellia, h…
Porcellio scaber
The sowbug (Porcellio scaber) is a small, gray, oval land crustacean, not an insect, related to shrimp and crabs. It h…
Aphis glycines
The soybean aphid (Aphis glycines) is a tiny pale yellow-green insect and the main aphid pest of US soybeans. An invas…
Mezium and Ptinus spp.
Spider beetles (family Ptinidae) are tiny, round-bodied beetles with long legs and antennae that make them look like s…
Pegomya hyoscyami
The spinach leafminer (Pegomya hyoscyami) is the larva of a small fly that tunnels between the upper and lower surface…
Lymantria dispar
The spongy moth (Lymantria dispar), formerly called the gypsy moth, is an invasive tree pest of the eastern United Sta…
Diabrotica undecimpunctata howardi
The spotted cucumber beetle (Diabrotica undecimpunctata howardi) is a yellow-green beetle with twelve black spots that…
Lycorma delicatula
The spotted lanternfly (Lycorma delicatula) is an invasive planthopper with gray black-spotted forewings and scarlet u…
Drosophila suzukii
The spotted wing drosophila (Drosophila suzukii) is a small fruit fly from Asia that attacks ripening soft fruit, unli…
Collembola (order)
Springtails (order Collembola) are tiny, wingless arthropods, usually under 2 mm, that leap using a spring-like tail. …
Choristoneura fumiferana
The spruce budworm (Choristoneura fumiferana) is the reddish-brown caterpillar of a native moth and one of the most de…
Oligonychus ununguis
The spruce spider mite (Oligonychus ununguis) is one of the most damaging pests of conifers, attacking spruce, juniper…
Epilachna borealis
The squash beetle (Epilachna borealis) is a plant-eating ladybug relative, orange-yellow with large black spots, that …
Anasa tristis
The squash bug (Anasa tristis) is a flat, grayish-brown shield-shaped insect and a major pest of squash, pumpkins, and…
Melittia cucurbitae
The squash vine borer (Melittia cucurbitae) is a fat white grub that tunnels inside squash, zucchini, and pumpkin stem…
Stomoxys calcitrans
Stable flies (Stomoxys calcitrans) look much like house flies but carry a bayonet-like mouthpart and bite. Both sexes …
Pyemotes tritici
The straw itch mite (Pyemotes tritici) is a nearly invisible mite that normally preys on grain and stored-product inse…
Centruroides vittatus
The striped bark scorpion (Centruroides vittatus) is the most common and widespread scorpion in the central and south-…
Acalymma vittatum
The striped cucumber beetle (Acalymma vittatum) is a small yellow beetle with three black stripes that attacks cucumbe…
Mephitis mephitis
The striped skunk (Mephitis mephitis) is a cat-sized black mammal marked by two white stripes down its back and a bush…
Reticulitermes spp.
Subterranean termites (Reticulitermes species) are soft, cream-colored social insects that eat wood and other cellulos…
Lygus lineolaris
The tarnished plant bug (Lygus lineolaris) is a small, mottled brown oval insect marked with a pale triangle on its ba…
Nylanderia fulva
The tawny crazy ant (Nylanderia fulva) is a small reddish-brown ant known for fast, erratic movement and staggering nu…
Solenopsis molesta
The thief ant (Solenopsis molesta) is one of the smallest house ants, pale yellow to light brown and easy to mistake f…
Order Thysanoptera
Thrips are tiny, slender insects, often under 1/16 inch, that rasp plant tissue and suck the juices, leaving silvery s…
Manduca sexta
The tobacco hornworm (Manduca sexta) is a large green caterpillar with seven white diagonal side stripes and a curved …
Manduca quinquemaculata
The tomato hornworm (Manduca quinquemaculata) is a large green caterpillar with white V-shaped marks and a dark tail h…
Membracidae spp.
Treehoppers (family Membracidae) are small sap-sucking true bugs with an enlarged, often thorn- or horn-shaped pronotu…
Blatta lateralis
The Turkestan cockroach (Blatta lateralis), or rusty red runner, is an outdoor-dwelling roach spreading across the sou…
Orgyia leucostigma
Tussock moths (Orgyia species) are caterpillars named for the distinctive tufts, or tussocks, of hair along their back…
Prosapia bicincta
The two-lined spittlebug (Prosapia bicincta) is a black, orange-striped insect of the southeastern US whose nymphs hid…
Tetranychus urticae
The two-spotted spider mite (Tetranychus urticae) is a tiny plant-feeding mite and a major pest of crops, gardens, and…
Agrilus bilineatus
The twolined chestnut borer (Agrilus bilineatus) is a native flatheaded beetle that attacks stressed oaks, and formerl…
Anthrenus verbasci
The varied carpet beetle (Anthrenus verbasci) is a tiny, round beetle mottled with white, brown, and yellow scales. It…
Liriomyza sativae
The vegetable leafminer (Liriomyza sativae) is a tiny black-and-yellow fly whose larvae tunnel winding, whitish mines …
Listroderes difficilis
The vegetable weevil (Listroderes difficilis) is a grayish-brown, short-snouted beetle whose adults and green larvae f…
Dasymutilla spp.
The velvet ant (Dasymutilla species), or 'cow killer,' is not an ant at all but a wingless female wasp covered in dens…
Didelphis virginiana
The Virginia opossum (Didelphis virginiana) is North America's only marsupial: a cat-sized, grayish-white animal with …
Datana integerrima
The walnut caterpillar (Datana integerrima) is a hairy, reddish-brown to black caterpillar that feeds in large groups …
Trogoderma variabile
The warehouse beetle (Trogoderma variabile) is a small, oval, mottled brown-and-black stored-product beetle. Its brist…
Tineola bisselliella
The webbing clothes moth (Tineola bisselliella) is a small, plain golden-buff moth that shuns light and hides in dark …
Leptoglossus occidentalis
The western conifer seed bug (Leptoglossus occidentalis) is a large brownish insect with flattened, leaf-like hind leg…
Malacosoma californicum
The western tent caterpillar (Malacosoma californicum) is a native caterpillar of the western United States that spins…
Arilus cristatus
The wheel bug (Arilus cristatus) is a large gray assassin bug named for the cog-like crest on its back. It is a benefi…
Scarabaeidae (Phyllophaga, Cyclocephala, and others)
White grubs are the plump, C-shaped, cream-colored larvae of scarab beetles like June beetles, chafers, and Japanese b…
Peromyscus leucopus
The white-footed mouse (Peromyscus leucopus) is a brown, white-bellied rodent with large eyes and white feet, common a…
Odocoileus virginianus
The white-tailed deer (Odocoileus virginianus) is a large brown browser named for the white underside of its tail. Abu…
Aleyrodidae spp.
Whiteflies are tiny, moth-like insects about 1/16 inch long that cluster on the undersides of leaves and fly up in a w…
Elateridae (click beetle larvae)
Wireworms are the slender, shiny, orange-brown larvae of click beetles that live in soil for years, feeding on seeds, …
Family Lycosidae
Wolf spiders (family Lycosidae) are large, hairy, fast-moving hunting spiders that chase prey on the ground instead of…
Family Picidae
Woodpeckers (family Picidae) are stiff-tailed climbing birds that peck wood with a chisel-like bill. Around homes they…
Eriosoma spp.
Woolly aphids (Eriosoma species) are small sap-sucking insects cloaked in white, cottony wax that makes colonies look …
Aedes aegypti
The yellow fever mosquito (Aedes aegypti) is a small dark mosquito with white lyre-shaped markings on its back. A dayt…
Argiope aurantia
The yellow garden spider (Argiope aurantia) is a large, striking black-and-yellow orb-weaver common in gardens across …
Cheiracanthium inclusum
The yellow sac spider (Cheiracanthium inclusum) is a small, pale yellow to greenish spider that hunts at night and res…
Vespula spp.
Yellowjackets (Vespula and Dolichovespula species) are black-and-yellow wasps that nest underground or in wall voids. …
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