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| Common Name | Scientific Name | Order | Family | Genus | Species | Author | notes |
|---|---|---|---|---|---|---|---|
| blue cactus borer | Melitara dentata (Grote) | LEPIDOPTERA | Pyralidae | Melitara | dentata | (Grote) | |
| blue horntail | Sirex cyaneus Fabricius | HYMENOPTERA | Siricidae | Sirex | cyaneus | Fabricius | |
| blue soldier fly | Exaireta spinigera (Wiedemann) | DIPTERA | Stratiomyidae | Exaireta | spinigera | (Wiedemann) | |
| blue spruce engraver | Ips hunteri Swaine | COLEOPTERA | Curculionidae | Ips | hunteri | Swaine | |
| blue-green sharpshooter | Graphocephala atropunctata (Signoret) | HEMIPTERA | Cicadellidae | Graphocephala | atropunctata | (Signoret) | |
| blueberry bud mite | Acalitus vaccinii (Keifer) | ACARI | Eriophyidae | Acalitus | vaccinii | (Keifer) | |
| blueberry case beetle | Neochlamisus cribripennis (LeConte) | COLEOPTERA | Chrysomelidae | Neochlamisus | cribripennis | (LeConte) | |
| blueberry flea beetle | Altica sylvia Malloch | COLEOPTERA | Chrysomelidae | Altica | sylvia | Malloch | |
| blueberry gall midge | Dasineura oxycoccana (Johnson) | DIPTERA | Cecidomyiidae | Dasineura | oxycoccana | (Johnson) | |
| blueberry maggot | Rhagoletis mendax Curran | DIPTERA | Tephritidae | Rhagoletis | mendax | Curran | |
| blueberry thrips | Frankliniella vaccinii Morgan | THYSANOPTERA | Thripidae | Frankliniella | vaccinii | Morgan | |
| blueberry tip midge | Prodiplosis vaccinii (Felt) | DIPTERA | Cecidomyiidae | Prodiplosis | vaccinii | (Felt) | |
| bluegrass billbug | Sphenophorus parvulus Gyllenhal | COLEOPTERA | Curculionidae | Sphenophorus | parvulus | Gyllenhal | |
| bluegrass webworm | Parapediasia teterrella (Zincken) | LEPIDOPTERA | Crambidae | Parapediasia | teterrella | (Zincken) | |
| bluntnosed cranberry leafhopper | Scleroracus vaccinii (Van Duzee) | HEMIPTERA | Cicadellidae | Scleroracus | vaccinii | (Van Duzee) | |
| body louse | Pediculus humanus humanus Linnaeus | PHTHIRAPTERA | Pediculidae | Pediculus | humanus humanus | Linnaeus | |
| Boisduval scale | Diaspis boisduvalii Signoret | HEMIPTERA | Diaspididae | Diaspis | boisduvalii | Signoret | |
| boll weevil | Anthonomus grandis grandis Boheman | COLEOPTERA | Curculionidae | Anthonomus | grandis grandis | Boheman | |
| bollworm* | Helicoverpa zea (Boddie) | LEPIDOPTERA | Noctuidae | Helicoverpa | zea | (Boddie) | *Also called corn earworm and tomato fruitworm |
| booklouse | Liposcelis corrodens Heymons | PSOCOPTERA | Liposcelididae | Liposcelis | corrodens | Heymons | |
| boreal spruce beetle | Dendroctonus punctatus LeConte | COLEOPTERA | Curculionidae | Dendroctonus | punctatus | LeConte | |
| boxelder aphid | Periphyllus negundinis (Thomas) | HEMIPTERA | Aphididae | Periphyllus | negundinis | (Thomas) | |
| boxelder bug | Boisea trivittata (Say) | HEMIPTERA | Rhopalidae | Boisea | trivittata | (Say) | |
| boxelder leafroller | Caloptilia negundella (Chambers) | LEPIDOPTERA | Gracillariidae | Caloptilia | negundella | (Chambers) | |
| boxelder psyllid | Cacopsylla negundinis Mally | HEMIPTERA | Psyllidae | Cacopsylla | negundinis | Mally | |
| boxelder twig borer | Proteoteras willingana (Kearfott) | LEPIDOPTERA | Tortricidae | Proteoteras | willingana | (Kearfott) | |
| boxwood leafminer | Monarthropalpus flavus (Schrank) | DIPTERA | Cecidomyiidae | Monarthropalpus | flavus | (Schrank) | |
| boxwood psyllid | Cacopsylla buxi (Linnaeus) | HEMIPTERA | Psyllidae | Cacopsylla | buxi | (Linnaeus) | |
| bramble leafhopper | Ribautiana tenerrima (Herrich-Schäffer) | HEMIPTERA | Cicadellidae | Ribautiana | tenerrima | (Herrich-Schäffer) | |
| Brasilian leafhopper | Protalebrella brasiliensis (Baker) | HEMIPTERA | Cicadellidae | Protalebrella | brasiliensis | (Baker) | |
| bristly cutworm | Lacinipolia renigera (Stephens) | LEPIDOPTERA | Noctuidae | Lacinipolia | renigera | (Stephens) | |
| bristly roseslug | Cladius difformis (Panzer) | HYMENOPTERA | Tenthredinidae | Cladius | difformis | (Panzer) | |
| broad mite | Polyphagotarsonemus latus (Banks) | ACARI | Tarsonemidae | Polyphagotarsonemus | latus | (Banks) | |
| broad necked root borer | Prionus laticollis (Drury) | COLEOPTERA | Cerambycidae | Prionus | laticollis | (Drury) | |
| broadbean weevil | Bruchus rufimanus Boheman | COLEOPTERA | Chrysomelidae | Bruchus | rufimanus | Boheman | |
| broadhorned flour beetle | Gnatocerus cornutus (Fabricius) | COLEOPTERA | Tenebrionidae | Gnatocerus | cornutus | (Fabricius) | |
| broadnosed grain weevil | Caulophilus oryzae (Gyllenhal) | COLEOPTERA | Curculionidae | Caulophilus | oryzae | (Gyllenhal) | |
| broadwinged katydid | Microcentrum rhombifolium (Saussure) | ORTHOPTERA | Tettigoniidae | Microcentrum | rhombifolium | (Saussure) | |
| bromegrass seed midge | Contarinia bromicola (Marikovskij & Agafonova) | DIPTERA | Cecidomyiidae | Contarinia | bromicola | (Marikovskij & Agafonova) | |
| bronze appletree weevil | Magdalis aenescens LeConte | COLEOPTERA | Curculionidae | Magdalis | aenescens | LeConte | |
| bronze birch borer | Agrilus anxius Gory | COLEOPTERA | Buprestidae | Agrilus | anxius | Gory | |
| bronze leaf beetle | Diachus auratus (Fabricius) | COLEOPTERA | Chrysomelidae | Diachus | auratus | (Fabricius) | |
| bronze poplar borer | Agrilus liragus Barter & Brown | COLEOPTERA | Buprestidae | Agrilus | liragus | Barter & Brown | |
| bronzed cutworm | Nephelodes minians Guenée | LEPIDOPTERA | Noctuidae | Nephelodes | minians | Guenée | |
| brown chicken louse | Goniodes dissimilis Denny | PHTHIRAPTERA | Philopteridae | Goniodes | dissimilis | Denny | |
| brown citrus aphid | Toxoptera citricidus (Kirkaldy) | HEMIPTERA | Aphididae | Toxoptera | citricidus | (Kirkaldy) | |
| brown cockroach | Periplaneta brunnea Burmeister | BLATTODEA | Blattidae | Periplaneta | brunnea | Burmeister | |
| brown cotton leafworm | Tarache dacia (Druce) | LEPIDOPTERA | Noctuidae | Tarache | dacia | (Druce) | |
| brown dog tick | Rhipicephalus sanguineus (Latreille) | ACARI | Ixodidae | Rhipicephalus | sanguineus | (Latreille) | |
| brown dung beetle | Digitonthophagus gazella (Fabricius) | COLEOPTERA | Scarabaeidae | Digitonthophagus | gazella | (Fabricius) | |
| brown flour mite | Gohieria fusca (Oudemans) | ACARI | Glycyphagidae | Gohieria | fusca | (Oudemans) | |
| brown garden snail | Cryptomphalus aspersus Müller | STYLOMMATOPHORA | Helicidae | Cryptomphalus | aspersus | Müller | |
| brown house moth | Hofmannophila pseudospretella (Stainton) | LEPIDOPTERA | Oecophoridae | Hofmannophila | pseudospretella | (Stainton) | |
| brown marmorated stink bug | Halyomorpha halys (Stål) | HEMIPTERA | Pentatomidae | Halyomorpha | halys | (Stål) | |
| brown mite | Bryobia rubrioculus (Scheuten) | ACARI | Tetranychidae | Bryobia | rubrioculus | (Scheuten) | |
| brown pineapple scale | Melanaspis bromiliae (Leonardi) | HEMIPTERA | Diaspididae | Melanaspis | bromiliae | (Leonardi) | |
| brown recluse spider | Loxosceles reclusa Gertsch & Mulaik | ARANEAE | Sicariidae | Loxosceles | reclusa | Gertsch & Mulaik | |
| brown saltmarsh mosquito | Aedes cantator (Coquillett) | DIPTERA | Culicidae | Aedes | cantator | (Coquillett) | |
| brown soft scale | Coccus hesperidum Linnaeus | HEMIPTERA | Coccidae | Coccus | hesperidum | Linnaeus | |
| brown speckled leafhopper | Paraphlepsius irroratus (Say) | HEMIPTERA | Cicadellidae | Paraphlepsius | irroratus | (Say) | |
| brown spider beetle | Ptinus clavipes Panzer | COLEOPTERA | Ptinidae | Ptinus | clavipes | Panzer | |
| brown stink bug | Euschistus servus (Say) | HEMIPTERA | Pentatomidae | Euschistus | servus | (Say) | |
| brown wheat mite | Petrobia latens (Müller) | ACARI | Tetranychidae | Petrobia | latens | (Müller) | |
| brown widow spider | Latrodectus geometricus C.L. Koch | ARANEAE | Theridiidae | Latrodectus | geometricus | C.L. Koch | |
| brownbanded cockroach | Supella longipalpa (Fabricius) | BLATTODEA | Blattellidae | Supella | longipalpa | (Fabricius) | |
| brownbelted bumble bee | Bombus griseocollis (De Geer) | HYMENOPTERA | Apidae | Bombus | griseocollis | (De Geer) | |
| brownheaded ash sawfly | Tomostethus multicinctus (Rohwer) | HYMENOPTERA | Tenthredinidae | Tomostethus | multicinctus | (Rohwer) | |
| brownheaded jack pine sawfly | Neodiprion dubiosus Schedl | HYMENOPTERA | Diprionidae | Neodiprion | dubiosus | Schedl | |
| brownlegged grain mite | Aleuroglyphus ovatus (Troupeau) | ACARI | Acaridae | Aleuroglyphus | ovatus | (Troupeau) | |
| browntail moth | Euproctis chrysorrhoea (Linnaeus) | LEPIDOPTERA | Lymantriidae | Euproctis | chrysorrhoea | (Linnaeus) | |
| Bruce spanworm | Operophtera bruceata (Hulst) | LEPIDOPTERA | Geometridae | Operophtera | bruceata | (Hulst) | |
| buck moth | Hemileuca maia (Drury) | LEPIDOPTERA | Saturniidae | Hemileuca | maia | (Drury) | |
| buckthorn aphid | Aphis nasturtii Kaltenbach | HEMIPTERA | Aphididae | Aphis | nasturtii | Kaltenbach | |
| buffalo treehopper | Stictocephala bisonia Kopp & Yonke | HEMIPTERA | Membracidae | Stictocephala | bisonia | Kopp & Yonke | |
| buffalograss webworm | Surattha indentella Kearfott | LEPIDOPTERA | Crambidae | Surattha | indentella | Kearfott | |
| bulb mite | Rhizoglyphus echinopus (Fumouze & Robin) | ACARI | Acaridae | Rhizoglyphus | echinopus | (Fumouze & Robin) | |
| bulb scale mite | Steneotarsonemus laticeps (Halbert) | ACARI | Tarsonemidae | Steneotarsonemus | laticeps | (Halbert) | |
| bull pine sawfly | Zadiprion townsendi (Cockerell) | HYMENOPTERA | Diprionidae | Zadiprion | townsendi | (Cockerell) | |
| bumble flower beetle | Euphoria inda (Linnaeus) | COLEOPTERA | Scarabaeidae | Euphoria | inda | (Linnaeus) | |
| bumelia fruit fly | Anastrepha pallens Coquillett | DIPTERA | Tephritidae | Anastrepha | pallens | Coquillett | |
| burdock borer | Papaipema cataphracta (Grote) | LEPIDOPTERA | Noctuidae | Papaipema | cataphracta | (Grote) | |
| Burmeister mantid | Orthodera burmeisteri Wood-Mason | MANTODEA | Mantidae | Orthodera | burmeisteri | Wood-Mason | |
| butternut curculio | Conotrachelus juglandis LeConte | COLEOPTERA | Curculionidae | Conotrachelus | juglandis | LeConte | |
| cabbage aphid | Brevicoryne brassicae (Linnaeus) | HEMIPTERA | Aphididae | Brevicoryne | brassicae | (Linnaeus) | |
| cabbage curculio | Ceutorhynchus rapae Gyllenhal | COLEOPTERA | Curculionidae | Ceutorhynchus | rapae | Gyllenhal | |
| cabbage looper | Trichoplusia ni (Hübner) | LEPIDOPTERA | Noctuidae | Trichoplusia | ni | (Hübner) | |
| cabbage maggot | Delia radicum (Linnaeus) | DIPTERA | Anthomyiidae | Delia | radicum | (Linnaeus) | |
| cabbage seedpod weevil | Ceutorhynchus assimilis (Paykull) | COLEOPTERA | Curculionidae | Ceutorhynchus | assimilis | (Paykull) | |
| cabbage seedstalk curculio | Ceutorhynchus quadridens (Panzer) | COLEOPTERA | Curculionidae | Ceutorhynchus | quadridens | (Panzer) | |
| cabbage webworm | Hellula rogatalis (Hulst) | LEPIDOPTERA | Crambidae | Hellula | rogatalis | (Hulst) | |
| cactus moth | Cactoblastis cactorum (Berg) | LEPIDOPTERA | Pyralidae | Cactoblastis | cactorum | (Berg) | |
| cactus scale | Diaspis echinocacti (Bouch) | HEMIPTERA | Diaspididae | Diaspis | echinocacti | (Bouch) | |
| cadelle | Tenebroides mauritanicus (Linnaeus) | COLEOPTERA | Trogossitidae | Tenebroides | mauritanicus | (Linnaeus) | |
| Caledonia seed bug | Nysius caledoniae Distant | HEMIPTERA | Lygaeidae | Nysius | caledoniae | Distant | |
| calico scale | Eulecanium cerasorum (Cockerell) | HEMIPTERA | Coccidae | Eulecanium | cerasorum | (Cockerell) | |
| California bumble bee | Bombus californicus Smith | HYMENOPTERA | Apidae | Bombus | californicus | Smith | |
| California fivespined ips | Ips paraconfusus Lanier | COLEOPTERA | Curculionidae | Ips | paraconfusus | Lanier | |
| California flatheaded borer | Phaenops californica (Van Dyke) | COLEOPTERA | Buprestidae | Phaenops | californica | (Van Dyke) | |
| California harvester ant | Pogonomyrmex californicus (Buckley) | HYMENOPTERA | Formicidae | Pogonomyrmex | californicus | (Buckley) | |
| California oakworm | Phryganidia californica Packard | LEPIDOPTERA | Notodontidae | Phryganidia | californica | Packard | |
| California pear sawfly | Pristiphora abbreviata (Hartig) | HYMENOPTERA | Tenthredinidae | Pristiphora | abbreviata | (Hartig) | |
| California prionus | Prionus californicus Motschulsky | COLEOPTERA | Cerambycidae | Prionus | californicus | Motschulsky | |
| California red scale | Aonidiella aurantii (Maskell) | HEMIPTERA | Diaspididae | Aonidiella | aurantii | (Maskell) | |
| California saltmarsh mosquito | Aedes squamiger (Coquillett) | DIPTERA | Culicidae | Aedes | squamiger | (Coquillett) | |
| California tortoiseshell | Nymphalis californica (Boisduval) | LEPIDOPTERA | Nymphalidae | Nymphalis | californica | (Boisduval) | |
| camellia scale | Lepidosaphes camelliae Hoke | HEMIPTERA | Diaspididae | Lepidosaphes | camelliae | Hoke | |
| camphor scale | Pseudaonidia duplex (Cockerell) | HEMIPTERA | Diaspididae | Pseudaonidia | duplex | (Cockerell) | |
| camphor shot borer | Xylosandrus mutilatus (Blandford) | COLEOPTERA | Curculionidae | Cnestus | mutilatus | (Blandford) | |
| camphor thrips | Liothrips floridensis (Watson) | THYSANOPTERA | Phlaeothripidae | Liothrips | floridensis | (Watson) | |
| caragana aphid | Acyrthosiphon caraganae (Cholodkovsky) | HEMIPTERA | Aphididae | Acyrthosiphon | caraganae | (Cholodkovsky) | |
| caragana blister beetle | Epicauta subglabra (Fall) | COLEOPTERA | Meloidae | Epicauta | subglabra | (Fall) | |
| caragana plant bug | Lopidea dakota Knight | HEMIPTERA | Miridae | Lopidea | dakota | Knight | |
| Caribbean black scale | Saissetia neglecta De Lotto | HEMIPTERA | Coccidae | Saissetia | neglecta | De Lotto | |
| Caribbean cicada killer | Sphecius hogardii (Latreille) | HYMENOPTERA | Crabronidae | Sphecius | hogardii | (Latreille) | |
| Caribbean fruit fly | Anastrepha suspensa (Loew) | DIPTERA | Tephritidae | Anastrepha | suspensa | (Loew) | |
| Caribbean pod borer | Fundella pellucens Zeller | LEPIDOPTERA | Pyralidae | Fundella | pellucens | Zeller | |
| carmine spider mite | Tetranychus cinnabarinus (Boisduval) | ACARI | Tetranychidae | Tetranychus | cinnabarinus | (Boisduval) | |
| carnation maggot | Delia brunnescens (Zetterstedt) | DIPTERA | Anthomyiidae | Delia | brunnescens | (Zetterstedt) | |
| carnation tip maggot | Delia echinata (Séguy) | DIPTERA | Anthomyiidae | Delia | echinata | (Séguy) | |
| carob moth | Ectomyelois ceratoniae (Zeller) | LEPIDOPTERA | Pyralidae | Ectomyelois | ceratoniae | (Zeller) | |
| Carolina conifer aphid | Cinara atlantica (Wilson) | HEMIPTERA | Aphididae | Cinara | atlantica | (Wilson) | |
| Carolina grasshopper | Dissosteira carolina (Linnaeus) | ORTHOPTERA | Acrididae | Dissosteira | carolina | (Linnaeus) | |
| Carolina mantid | Stagmomantis carolina (Johannson) | MANTODEA | Mantidae | Stagmomantis | carolina | (Johannson) | |
| carpenter bee | Xylocopa virginica (Linnaeus) | HYMENOPTERA | Anthophoridae | Xylocopa | virginica | (Linnaeus) | |
| carpenterworm | Prionoxystus robiniae (Peck) | LEPIDOPTERA | Cossidae | Prionoxystus | robiniae | (Peck) | |
| carpet beetle | Anthrenus scrophulariae (Linnaeus) | COLEOPTERA | Dermestidae | Anthrenus | scrophulariae | (Linnaeus) | |
| carpet moth | Trichophaga tapetzella (Linnaeus) | LEPIDOPTERA | Tineidae | Trichophaga | tapetzella | (Linnaeus) | |
| carrot beetle | Tomarus gibbosus (De Geer) | COLEOPTERA | Scarabaeidae | Tomarus | gibbosus | (De Geer) | |
| carrot rust fly | Psila rosae (Fabricius) | DIPTERA | Psilidae | Psila | rosae | (Fabricius) | |
| carrot weevil | Listronotus oregonensis (LeConte) | COLEOPTERA | Curculionidae | Listronotus | oregonensis | (LeConte) | |
| casemaking clothes moth | Tinea pellionella Linnaeus | LEPIDOPTERA | Tineidae | Tinea | pellionella | Linnaeus | |
| cat flea | Ctenocephalides felis (Bouché) | SIPHONAPTERA | Pulicidae | Ctenocephalides | felis | (Bouché) | |
| cat follicle mite | Demodex cati Mégnin | ACARI | Demodicidae | Demodex | cati | Mégnin | |
| cat louse | Felicola subrostratus (Burmeister) | PHTHIRAPTERA | Trichodectidae | Felicola | subrostratus | (Burmeister) | |
| catalpa midge | Contarinia catalpae (Comstock) | DIPTERA | Cecidomyiidae | Contarinia | catalpae | (Comstock) | |
| catalpa sphinx | Ceratomia catalpae (Boisduval) | LEPIDOPTERA | Sphingidae | Ceratomia | catalpae | (Boisduval) | |
| cattle biting louse | Bovicola bovis (Linnaeus) | PHTHIRAPTERA | Trichodectidae | Bovicola | bovis | (Linnaeus) | |
| cattle follicle mite | Demodex bovis Stiles | ACARI | Demodicidae | Demodex | bovis | Stiles | |
| cattle itch mite | Sarcoptes bovis Robin | ACARI | Sarcoptidae | Sarcoptes | bovis | Robin | |
| cattle tail louse | Haematopinus quadripertusus Fahrenholz | PHTHIRAPTERA | Haematopinidae | Haematopinus | quadripertusus | Fahrenholz | |
| cattle tick | Boophilus annulatus (Say) | ACARI | Ixodidae | Boophilus | annulatus | (Say) | |
| Cayenne tick | Amblyomma cajennense (Fabricius) | ACARI | Ixodidae | Amblyomma | cajennense | (Fabricius) | |
| ceanothus silk moth | Hyalophora euryalus (Boisduval) | LEPIDOPTERA | Saturniidae | Hyalophora | euryalus | (Boisduval) | |
| cecropia moth | Hyalophora cecropia (Linnaeus) | LEPIDOPTERA | Saturniidae | Hyalophora | cecropia | (Linnaeus) | |
| cedartree borer | Semanotus ligneus (Fabricius) | COLEOPTERA | Cerambycidae | Semanotus | ligneus | (Fabricius) | |
| celery aphid | Semiaphis heraclei Takahashi | HEMIPTERA | Aphididae | Semiaphis | heraclei | Takahashi | |
| celery leaftier* | Udea rubigalis (Guenée) | LEPIDOPTERA | Crambidae | Udea | rubigalis | (Guenée) | *Also called greenhouse leaftier |
| celery looper | Anagrapha falcifera (Kirby) | LEPIDOPTERA | Noctuidae | Anagrapha | falcifera | (Kirby) | |
| cereal leaf beetle | Oulema melanopus (Linnaeus) | COLEOPTERA | Chrysomelidae | Oulema | melanopus | (Linnaeus) | |
| chaff scale | Parlatoria pergandii Comstock | HEMIPTERA | Diaspididae | Parlatoria | pergandii | Comstock | |
| chainspotted geometer | Cingilia catenaria (Drury) | LEPIDOPTERA | Geometridae | Cingilia | catenaria | (Drury) | |
| changa | Scapteriscus didactylus (Latreille) | ORTHOPTERA | Gryllotalpidae | Scapteriscus | didactylus | (Latreille) | |
| charcoal beetle | Melanophila consputa LeConte | COLEOPTERA | Buprestidae | Melanophila | consputa | LeConte | |
| checkered melon beetle | Paranapiacaba tricincta (Say) | COLEOPTERA | Chrysomelidae | Paranapiacaba | tricincta | (Say) | |
| cheese mite | Tyrolichus casei Oudemans | ACARI | Acaridae | Tyrolichus | casei | Oudemans | |
| cheese skipper | Piophila casei (Linnaeus) | DIPTERA | Piophilidae | Piophila | casei | (Linnaeus) | |
| cherry casebearer | Coleophora pruniella Clemens | LEPIDOPTERA | Coleophoridae | Coleophora | pruniella | Clemens | |
| cherry fruit fly* | Rhagoletis cingulata (Loew) | DIPTERA | Tephritidae | Rhagoletis | cingulata | (Loew) | *Immature called cherry maggot |
| cherry fruit sawfly | Hoplocampa cookei (Clarke) | HYMENOPTERA | Tenthredinidae | Hoplocampa | cookei | (Clarke) | |
| cherry fruitworm | Grapholita packardi Zeller | LEPIDOPTERA | Tortricidae | Grapholita | packardi | Zeller | |
| cherry leaf beetle | Tricholochmaea cavicollis (LeConte) | COLEOPTERA | Chrysomelidae | Tricholochmaea | cavicollis | (LeConte) | |
| cherry maggot* | Rhagoletis cingulata (Loew) | DIPTERA | Tephritidae | Rhagoletis | cingulata | (Loew) | *Adult called cherry fruit fly |
| chestnut timberworm | Melittomma sericeum (Harris) | COLEOPTERA | Lymexylidae | Melittomma | sericeum | (Harris) | |
| chicken body louse | Menacanthus stramineus (Nitzsch) | PHTHIRAPTERA | Menoponidae | Menacanthus | stramineus | (Nitzsch) | |
| chicken dung fly | Fannia pusio (Wiedemann) | DIPTERA | Muscidae | Fannia | pusio | (Wiedemann) | |
| chicken head louse | Cuclotogaster heterographus (Nitzsch) | PHTHIRAPTERA | Philopteridae | Cuclotogaster | heterographus | (Nitzsch) | |
| chicken mite | Dermanyssus gallinae (De Geer) | ACARI | Dermanyssidae | Dermanyssus | gallinae | (De Geer) | |
| chigoe | Tunga penetrans (Linnaeus) | SIPHONAPTERA | Tungidae | Tunga | penetrans | (Linnaeus) | |
| Chilean recluse spider | Loxosceles laeta (Nicolet) | ARANEAE | Sicariidae | Loxosceles | laeta | (Nicolet) | |
| chilli thrips | Scirtothrips dorsalis Hood | THYSANOPTERA | Thripidae | Scirtothrips | dorsalis | Hood | |
| chimney swift bug | Cimexopsis nyctalis List | HEMIPTERA | Cimicidae | Cimexopsis | nyctalis | List | |
| chinch bug | Blissus leucopterus leucopterus (Say) | HEMIPTERA | Blissidae | Blissus | leucopterus leucopterus | (Say) | |
| Chinese dryinid | Pseudogonatopus hospes Perkins | HYMENOPTERA | Dryinidae | Pseudogonatopus | hospes | Perkins | |
| Chinese mantid | Tenodera aridifolia sinensis Saussure | MANTODEA | Mantidae | Tenodera | aridifolia sinensis | Saussure | |
| Chinese obscure scale | Parlatoreopsis chinensis (Marlatt) | HEMIPTERA | Diaspididae | Parlatoreopsis | chinensis | (Marlatt) | |
| Chinese rose beetle | Adoretus sinicus Burmeister | COLEOPTERA | Scarabaeidae | Adoretus | sinicus | Burmeister | |
| chokecherry leafroller | Sparganothis directana (Walker) | LEPIDOPTERA | Tortricidae | Sparganothis | directana | (Walker) | |
| chokecherry midge | Contarinia virginianae (Felt) | DIPTERA | Cecidomyiidae | Contarinia | virginianae | (Felt) | |
| Christmas berry webworm | Cryptoblabes gnidiella (Milli | LEPIDOPTERA | Pyralidae | Cryptoblabes | gnidiella | (Milli | |
| chrysanthemum aphid | Macrosiphoniella sanborni (Gillette) | HEMIPTERA | Aphididae | Macrosiphoniella | sanborni | (Gillette) | |
| chrysanthemum flower borer | Lorita scarificata (Meyrick) | LEPIDOPTERA | Tortricidae | Lorita | scarificata | (Meyrick) | |
| chrysanthemum gall midge | Rhopalomyia chrysanthemi (Ahlberg) | DIPTERA | Cecidomyiidae | Rhopalomyia | chrysanthemi | (Ahlberg) | |
| chrysanthemum lace bug | Corythucha marmorata (Uhler) | HEMIPTERA | Tingidae | Corythucha | marmorata | (Uhler) | |
| chrysanthemum leafminer | Chromatomyia syngenesiae Hardy | DIPTERA | Agromyzidae | Chromatomyia | syngenesiae | Hardy | |
| chrysanthemum thrips | Thrips nigropilosus Uzel | THYSANOPTERA | Thripidae | Thrips | nigropilosus | Uzel | |
| cicada killer* | Sphecius speciosus (Drury) | HYMENOPTERA | Crabronidae | Sphecius | speciosus | (Drury) | *Also called eastern cicada killer |
| cigar casebearer* | Coleophora serratella (Linnaeus) | LEPIDOPTERA | Coleophoridae | Coleophora | serratella | (Linnaeus) | *Also called birch casebearer |
| cigarette beetle | Lasioderma serricorne (Fabricius) | COLEOPTERA | Anobiidae | Lasioderma | serricorne | (Fabricius) | |
| cinereous cockroach | Nauphoeta cinerea (Olivier) | BLATTODEA | Blaberidae | Nauphoeta | cinerea | (Olivier) | |
| cinnabar moth | Tyria jacobaeae (Linnaeus) | LEPIDOPTERA | Arctiidae | Tyria | jacobaeae | (Linnaeus) | |
| citricola scale | Coccus pseudomagnoliarum (Kuwana) | HEMIPTERA | Coccidae | Coccus | pseudomagnoliarum | (Kuwana) | |
| citrophilus mealybug | Pseudococcus calceolariae (Maskell) | HEMIPTERA | Pseudococcidae | Pseudococcus | calceolariae | (Maskell) | |
| citrus blackfly | Aleurocanthus woglumi Ashby | HEMIPTERA | Aleyrodidae | Aleurocanthus | woglumi | Ashby | |
| citrus bud mite | Aceria sheldoni (Ewing) | ACARI | Eriophyidae | Aceria | sheldoni | (Ewing) | |
| citrus flat mite | Brevipalpus lewisi McGregor | ACARI | Tenuipalpidae | Brevipalpus | lewisi | McGregor | |
| citrus longhorned beetle | Anoplophora chinensis (Forster) | COLEOPTERA | Cerambycidae | Anoplophora | chinensis | (Förster) | |
| citrus mealybug | Planococcus citri (Risso) | HEMIPTERA | Pseudococcidae | Planococcus | citri | (Risso) | |
| citrus red mite | Panonychus citri (McGregor) | ACARI | Tetranychidae | Panonychus | citri | (McGregor) | |
| citrus root weevil | Pachnaeus litus (Germar) | COLEOPTERA | Curculionidae | Pachnaeus | litus | (Germar) | |
| citrus rust mite | Phyllocoptruta oleivora (Ashmead) | ACARI | Eriophyidae | Phyllocoptruta | oleivora | (Ashmead) | |
| citrus snow scale | Unaspis citri (Comstock) | HEMIPTERA | Diaspididae | Unaspis | citri | (Comstock) | |
| citrus swallowtail | Papilio xuthus Linnaeus | LEPIDOPTERA | Papilionidae | Papilio | xuthus | Linnaeus | |
| citrus thrips | Scirtothrips citri (Moulton) | THYSANOPTERA | Thripidae | Scirtothrips | citri | (Moulton) | |
| citrus whitefly | Dialeurodes citri (Ashmead) | HEMIPTERA | Aleyrodidae | Dialeurodes | citri | (Ashmead) | |
| claybacked cutworm | Agrotis gladiaria Morrison | LEPIDOPTERA | Noctuidae | Agrotis | gladiaria | Morrison | |
| claycolored billbug | Sphenophorus aequalis aequalis Gyllenhal | COLEOPTERA | Curculionidae | Sphenophorus | aequalis aequalis | Gyllenhal | |
| claycolored leaf beetle | Anomoea laticlavia (Förster) | COLEOPTERA | Chrysomelidae | Anomoea | laticlavia | (Förster) | |
| Clear Lake gnat | Chaoborus astictopus Dyar & Shannon | DIPTERA | Chaoboridae | Chaoborus | astictopus | Dyar & Shannon | |
| clearwinged grasshopper | Camnula pellucida (Scudder) | ORTHOPTERA | Acrididae | Camnula | pellucida | (Scudder) | |
| clematis blister beetle | Epicauta cinerea (Förster) | COLEOPTERA | Meloidae | Epicauta | cinerea | (Förster) | |
| clidemia leafroller | Blepharomastix ebulealis (Guenée) | LEPIDOPTERA | Crambidae | Blepharomastix | ebulealis | (Guenée) | |
| clidemia thrips | Liothrips urichi Karny | THYSANOPTERA | Phlaeothripidae | Liothrips | urichi | Karny | |
| clouded plant bug | Neurocolpus nubilus (Say) | HEMIPTERA | Miridae | Neurocolpus | nubilus | (Say) | |
| clouded sulfur | Colias philodice Godart | LEPIDOPTERA | Pieridae | Colias | philodice | Godart | |
| cloudywinged whitefly | Dialeurodes citrifolii (Morgan) | HEMIPTERA | Aleyrodidae | Dialeurodes | citrifolii | (Morgan) | |
| clover aphid | Nearctaphis bakeri (Cowen) | HEMIPTERA | Aphididae | Nearctaphis | bakeri | (Cowen) | |
| clover aphid parasite | Aphelinus lapisligni Howard | HYMENOPTERA | Encyrtidae | Aphelinus | lapisligni | Howard | |
| clover cutworm | Anarta trifolii (Hufnagel) | LEPIDOPTERA | Noctuidae | Anarta | trifolii | (Hufnagel) | |
| clover hayworm | Hypsopygia costalis (Fabricius) | LEPIDOPTERA | Pyralidae | Hypsopygia | costalis | (Fabricius) | |
| clover head caterpillar | Grapholita interstinctana (Clemens) | LEPIDOPTERA | Tortricidae | Grapholita | interstinctana | (Clemens) | |
| clover head weevil | Hypera meles (Fabricius) | COLEOPTERA | Curculionidae | Hypera | meles | (Fabricius) | |
| clover leaf midge | Dasineura trifolii (Loew) | DIPTERA | Cecidomyiidae | Dasineura | trifolii | (Loew) | |
| clover leaf weevil | Hypera zonalis (Scopoli) | COLEOPTERA | Curculionidae | Hypera | zonalis | (Scopoli) | |
| clover leafhopper | Aceratagallia sanguinolenta (Provancher) | HEMIPTERA | Cicadellidae | Aceratagallia | sanguinolenta | (Provancher) | |
| clover looper | Caenurgina crassiuscula (Haworth) | LEPIDOPTERA | Noctuidae | Caenurgina | crassiuscula | (Haworth) | |
| clover mite | Bryobia praetiosa Koch | ACARI | Tetranychidae | Bryobia | praetiosa | Koch | |
| clover root borer | Hylastinus obscurus (Marsham) | COLEOPTERA | Curculionidae | Hylastinus | obscurus | (Marsham) | |
| clover root curculio | Sitona hispidulus (Fabricius) | COLEOPTERA | Curculionidae | Sitona | hispidulus | (Fabricius) | |
| clover seed chalcid | Bruchophagus gibbus (Boheman) | HYMENOPTERA | Eurytomidae | Bruchophagus | gibbus | (Boheman) | |
| clover seed midge | Dasineura leguminicola (Lintner) | DIPTERA | Cecidomyiidae | Dasineura | leguminicola | (Lintner) | |
| clover seed weevil | Tychius picirostris (Fabricius) | COLEOPTERA | Curculionidae | Tychius | picirostris | (Fabricius) | |
| clover stem borer | Languria mozardi Latreille | COLEOPTERA | Languriidae | Languria | mozardi | Latreille | |
| cluster fly | Pollenia rudis (Fabricius) | DIPTERA | Calliphoridae | Pollenia | rudis | (Fabricius) | |
| cochineal insect | Dactylopius coccus Costa | HEMIPTERA | Dactylopiidae | Dactylopius | coccus | Costa | |
| cocklebur weevil | Rhodobaenus quinquedecimpunctatus (Say) | COLEOPTERA | Curculionidae | Rhodobaenus | quinquedecimpunctatus | (Say) | |
| coconut leafminer | Agonoxena argaula Meyrick | LEPIDOPTERA | Agonoxenidae | Agonoxena | argaula | Meyrick | |
| coconut leafroller | Omiodes blackburni (Butler) | LEPIDOPTERA | Crambidae | Omiodes | blackburni | (Butler) | |
| coconut mealybug | Nipaecoccus nipae (Maskell) | HEMIPTERA | Pseudococcidae | Nipaecoccus | nipae | (Maskell) | |
| coconut scale | Aspidiotus destructor Signoret | HEMIPTERA | Diaspididae | Aspidiotus | destructor | Signoret | |
| codling moth | Cydia pomonella (Linnaeus) | LEPIDOPTERA | Tortricidae | Cydia | pomonella | (Linnaeus) | |
| coffee bean weevil | Araecerus fasciculatus (De Geer) | COLEOPTERA | Anthribidae | Araecerus | fasciculatus | (De Geer) | |
| coffee berry borer | Hypothenemus hampei (Ferrari) | COLEOPTERA | Curculionidae | Hypothenemus | hampei | (Ferrari) | |
| Colorado hairstreak | Hypaurotis crysalus (W.H. Edwards) | LEPIDOPTERA | Lycaenidae | Hypaurotis | crysalus | (W.H. Edwards) | |
| Colorado potato beetle | Leptinotarsa decemlineata (Say) | COLEOPTERA | Chrysomelidae | Leptinotarsa | decemlineata | (Say) | |
| Columbia Basin wireworm | Limonius subauratus LeConte | COLEOPTERA | Elateridae | Limonius | subauratus | LeConte | |
| Columbian timber beetle | Corthylus columbianus Hopkins | COLEOPTERA | Curculionidae | Corthylus | columbianus | Hopkins | |
| columbine borer | Papaipema leucostigma (Harris) | LEPIDOPTERA | Noctuidae | Papaipema | leucostigma | (Harris) | |
| columbine leafminer complex* | Phytomyza spp. | DIPTERA | Agromyzidae | Phytomyza | spp. | *Includes Phytomyza aquilegiana Frost, P. aquilegivora Spenser, and P. columbinae Sehgal | |
| Comanche lacewing | Chrysoperla comanche (Banks) | NEUROPTERA | Chrysopidae | Chrysoperla | comanche | (Banks) | |
| common Australian lady beetle | Coelophora inaequalis (Fabricius) | COLEOPTERA | Coccinellidae | Coelophora | inaequalis | (Fabricius) |