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| Common Name | Scientific Name | Order | Family | Genus | Species | Author | notes |
|---|---|---|---|---|---|---|---|
| prairie flea beetle | Altica canadensis Gentner | COLEOPTERA | Chrysomelidae | Altica | canadensis | Gentner | |
| prairie grain wireworm | Ctenicera aeripennis destructor (Brown) | COLEOPTERA | Elateridae | Ctenicera | aeripennis destructor | (Brown) | |
| privet aphid | Myzus ligustri (Mosley) | HEMIPTERA | Aphididae | Myzus | ligustri | (Mosley) | |
| privet leafminer | Caloptilia cuculipennella (Hübner) | LEPIDOPTERA | Gracillariidae | Caloptilia | cuculipennella | (Hübner) | |
| privet mite | Brevipalpus obovatus Donnadieu | ACARI | Tenuipalpidae | Brevipalpus | obovatus | Donnadieu | |
| privet thrips | Dendrothrips ornatus (Jablonowski) | THYSANOPTERA | Thripidae | Dendrothrips | ornatus | (Jablonowski) | |
| promethea moth | Callosamia promethea (Drury) | LEPIDOPTERA | Saturniidae | Callosamia | promethea | (Drury) | |
| pruinose bean weevil | Stator pruininus (Horn) | COLEOPTERA | Chrysomelidae | Stator | pruininus | (Horn) | |
| prune leafhopper | Edwardsiana prunicola (Edwards) | HEMIPTERA | Cicadellidae | Edwardsiana | prunicola | (Edwards) | |
| Puget Sound wireworm | Ctenicera aeripennis aeripennis (Kirby) | COLEOPTERA | Elateridae | Ctenicera | aeripennis aeripennis | (Kirby) | |
| puncturevine seed weevil | Microlarinus lareynii (Jacquelin du Val) | COLEOPTERA | Curculionidae | Microlarinus | lareynii | (Jacquelin du Val) | |
| puncturevine stem weevil | Microlarinus lypriformis (Wollaston) | COLEOPTERA | Curculionidae | Microlarinus | lypriformis | (Wollaston) | |
| purple scale | Lepidosaphes beckii (Newman) | HEMIPTERA | Diaspididae | Lepidosaphes | beckii | (Newman) | |
| purplebacked cabbageworm | Evergestis pallidata (Hufnagel) | LEPIDOPTERA | Crambidae | Evergestis | pallidata | (Hufnagel) | |
| purplespotted lily aphid | Macrosiphum lilii (Monell) | HEMIPTERA | Aphididae | Macrosiphum | lilii | (Monell) | |
| puss caterpillar | Megalopyge opercularis (J.E. Smith) | LEPIDOPTERA | Megalopygidae | Megalopyge | opercularis | (J.E. Smith) | |
| Putnam scale | Diaspidiotus ancylus (Putnam) | HEMIPTERA | Diaspididae | Diaspidiotus | ancylus | (Putnam) | |
| pyramid ant | Dorymyrmex insanus (Buckley) | HYMENOPTERA | Formicidae | Dorymyrmex | insanus | (Buckley) | |
| pyriform scale | Protopulvinaria pyriformis (Cockerell) | HEMIPTERA | Coccidae | Protopulvinaria | pyriformis | (Cockerell) | |
| quince curculio | Conotrachelus crataegi Walsh | COLEOPTERA | Curculionidae | Conotrachelus | crataegi | Walsh | |
| quince treehopper | Glossonotus crataegi (Fitch) | HEMIPTERA | Membracidae | Glossonotus | crataegi | (Fitch) | |
| rabbit louse | Haemodipsus ventricosus (Denny) | PHTHIRAPTERA | Polyplacidae | Haemodipsus | ventricosus | (Denny) | |
| rabbit tick | Haemaphysalis leporispalustris (Packard) | ACARI | Ixodidae | Haemaphysalis | leporispalustris | (Packard) | |
| ragweed borer | Epiblema strenuana (Walker) | LEPIDOPTERA | Tortricidae | Epiblema | strenuana | (Walker) | |
| ragweed plant bug | Chlamydatus associatus (Uhler) | HEMIPTERA | Miridae | Chlamydatus | associatus | (Uhler) | |
| rain beetles | Pleocoma spp. | COLEOPTERA | Scarabaeidae | Pleocoma | spp. | ||
| raisin moth | Cadra figulilella (Gregson) | LEPIDOPTERA | Pyralidae | Cadra | figulilella | (Gregson) | |
| range caterpillar | Hemileuca oliviae Cockerell | LEPIDOPTERA | Saturniidae | Hemileuca | oliviae | Cockerell | |
| range crane fly | Tipula simplex Doane | DIPTERA | Tipulidae | Tipula | simplex | Doane | |
| rapid plant bug | Adelphocoris rapidus (Say) | HEMIPTERA | Miridae | Adelphocoris | rapidus | (Say) | Synonymy of Adelphocoris superdus |
| raspberry bud moth | Lampronia rubiella (Bjerkander) | LEPIDOPTERA | Prodoxidae | Lampronia | rubiella | (Bjerkander) | |
| raspberry cane borer | Oberea bimaculata (Olivier) | COLEOPTERA | Cerambycidae | Oberea | bimaculata | (Olivier) | |
| raspberry cane maggot | Pegomya rubivora (Coquillett) | DIPTERA | Anthomyiidae | Pegomya | rubivora | (Coquillett) | |
| raspberry crown borer | Pennisetia marginata (Harris) | LEPIDOPTERA | Sesiidae | Pennisetia | marginata | (Harris) | |
| raspberry fruitworm | Byturus unicolor Say | COLEOPTERA | Byturidae | Byturus | unicolor | Say | |
| raspberry leafroller | Olethreutes permundana (Clemens) | LEPIDOPTERA | Tortricidae | Olethreutes | permundana | (Clemens) | |
| raspberry sawfly | Monophadnoides rubi (Harris) | HYMENOPTERA | Tenthredinidae | Monophadnoides | rubi | (Harris) | |
| red admiral | Vanessa atalanta (Fruhstorfer) | LEPIDOPTERA | Nymphalidae | Vanessa | atalanta | (Fruhstorfer) | |
| red and black flat mite | Brevipalpus phoenicis (Geijskes) | ACARI | Tenuipalpidae | Brevipalpus | phoenicis | (Geijskes) | |
| red assassin bug | Haematoloecha rubescens Distant | HEMIPTERA | Reduviidae | Haematoloecha | rubescens | Distant | |
| red carpenter ant | Camponotus chromaiodes Bolton | HYMENOPTERA | Formicidae | Camponotus | chromaiodes | Bolton | |
| red clover seed weevil | Tychius stephensi Schönherr | COLEOPTERA | Curculionidae | Tychius | stephensi | Schönherr | |
| red date scale | Phoenicococcus marlatti Cockerell | HEMIPTERA | Phoenicococcidae | Phoenicococcus | marlatti | Cockerell | |
| red elm bark weevil | Magdalis armicollis (Say) | COLEOPTERA | Curculionidae | Magdalis | armicollis | (Say) | |
| red flour beetle | Tribolium castaneum (Herbst) | COLEOPTERA | Tenebrionidae | Tribolium | castaneum | (Herbst) | |
| red grasshopper mite | Eutrombidium trigonum (Hermann) | ACARI | Trombidiidae | Eutrombidium | trigonum | (Hermann) | |
| red harvester ant | Pogonomyrmex barbatus (F. Smith) | HYMENOPTERA | Formicidae | Pogonomyrmex | barbatus | (F. Smith) | |
| red imported fire ant | Solenopsis invicta Buren | HYMENOPTERA | Formicidae | Solenopsis | invicta | Buren | |
| red milkweed beetle | Tetraopes tetrophthalmus (Förster) | COLEOPTERA | Cerambycidae | Tetraopes | tetrophthalmus | (Förster) | |
| red oak borer | Enaphalodes rufulus (Haldeman) | COLEOPTERA | Cerambycidae | Enaphalodes | rufulus | (Haldeman) | |
| red orchid scale | Furcaspis biformis (Cockerell) | HEMIPTERA | Diaspididae | Furcaspis | biformis | (Cockerell) | |
| red palm weevil | Rhynocophorus ferrugineus (Olivier) | COLEOPTERA | Curculionidae | Rhynocophorus | ferrugineus | (Olivier) | |
| red pine cone beetle* | Conophthorus resinosae Hopkins | COLEOPTERA | Curculionidae | Conophthorus | resinosae | Hopkins | *Also called jack pine tip beetle |
| red pine sawfly | Neodiprion nanulus nanulus Schedl | HYMENOPTERA | Diprionidae | Neodiprion | nanulus nanulus | Schedl | |
| red pine scale | Matsucoccus resinosae Bean & Godwin | HEMIPTERA | Margarodidae | Matsucoccus | resinosae | Bean & Godwin | |
| red pine shoot moth | Dioryctria resinosella Mutuura | LEPIDOPTERA | Pyralidae | Dioryctria | resinosella | Mutuura | |
| red sunflower seed weevil | Smicronyx fulvus LeConte | COLEOPTERA | Curculionidae | Smicronyx | fulvus | LeConte | |
| red turnip beetle | Entomoscelis americana Brown | COLEOPTERA | Chrysomelidae | Entomoscelis | americana | Brown | |
| red turpentine beetle | Dendroctonus valens LeConte | COLEOPTERA | Curculionidae | Dendroctonus | valens | LeConte | |
| red wax scale | Ceroplastes rubens Maskell | HEMIPTERA | Coccidae | Ceroplastes | rubens | Maskell | |
| redbacked cutworm | Euxoa ochrogaster (Guenée) | LEPIDOPTERA | Noctuidae | Euxoa | ochrogaster | (Guenée) | |
| redbanded leafroller | Argyrotaenia velutinana (Walker) | LEPIDOPTERA | Tortricidae | Argyrotaenia | velutinana | (Walker) | |
| redbanded stink bug | Piezodorus guildinii (Westwood) | HEMIPTERA | Pentatomidae | Piezodorus | guildinii | (Westwood) | |
| redbanded thrips | Selenothrips rubrocinctus (Giard) | THYSANOPTERA | Thripidae | Selenothrips | rubrocinctus | (Giard) | |
| redbay ambrosia beetle | Xyleborus glabratus Eichhoff | COLEOPTERA | Curculionidae | Xyleborus | glabratus | Eichhoff | |
| redbelted bumble bee | Bombus rufocinctus (Cresson) | HYMENOPTERA | Apidae | Bombus | rufocinctus | (Cresson) | |
| redberry mite | Acalitus essigi (Hassan) | ACARI | Eriophyidae | Acalitus | essigi | (Hassan) | |
| redblack oedemerid | Eobia bicolor (Fairmaire) | COLEOPTERA | Oedemeridae | Eobia | bicolor | (Fairmaire) | |
| redbud leaffolder | Fascista cercerisella (Chambers) | LEPIDOPTERA | Gelechiidae | Fascista | cercerisella | (Chambers) | |
| redhaired pine bark beetle | Hylurgus ligniperda (Fabricius) | COLEOPTERA | Curculionidae | Hylurgus | ligniperda | (Fabricius) | |
| redheaded ash borer | Neoclytus acuminatus (Fabricius) | COLEOPTERA | Cerambycidae | Neoclytus | acuminatus | (Fabricius) | |
| redheaded jack pine sawfly | Neodiprion rugifrons Middleton | HYMENOPTERA | Diprionidae | Neodiprion | rugifrons | Middleton | |
| redheaded pine sawfly | Neodiprion lecontei (Fitch) | HYMENOPTERA | Diprionidae | Neodiprion | lecontei | (Fitch) | |
| redhumped caterpillar | Schizura concinna (J.E. Smith) | LEPIDOPTERA | Notodontidae | Schizura | concinna | (J.E. Smith) | |
| redlegged flea beetle | Derocrepis erythropus (Melsheimer) | COLEOPTERA | Chrysomelidae | Derocrepis | erythropus | (Melsheimer) | |
| redlegged grasshopper | Melanoplus femurrubrum (De Geer) | ORTHOPTERA | Acrididae | Melanoplus | femurrubrum | (De Geer) | |
| redlegged ham beetle | Necrobia rufipes (De Geer) | COLEOPTERA | Cleridae | Necrobia | rufipes | (De Geer) | |
| redmargined assassin bug | Scadra rufidens Stål | HEMIPTERA | Reduviidae | Scadra | rufidens | Stål | |
| rednecked cane borer | Agrilus ruficollis (Fabricius) | COLEOPTERA | Buprestidae | Agrilus | ruficollis | (Fabricius) | |
| rednecked peanutworm | Stegasta bosqueella (Chambers) | LEPIDOPTERA | Gelechiidae | Stegasta | bosqueella | (Chambers) | |
| redshouldered ham beetle | Necrobia ruficollis (Fabricius) | COLEOPTERA | Cleridae | Necrobia | ruficollis | (Fabricius) | |
| redshouldered stink bug | Thyanta custator accerra McAtee | HEMIPTERA | Pentatomidae | Thyanta | custator accerra | McAtee | |
| redtailed spider wasp | Tachypompilus analis (Fabricius) | HYMENOPTERA | Pompilidae | Tachypompilus | analis | (Fabricius) | |
| redtailed tachina | Winthemia quadripustulata (Fabricius) | DIPTERA | Tachinidae | Winthemia | quadripustulata | (Fabricius) | |
| regal moth* | Citheronia regalis (Fabricius) | LEPIDOPTERA | Saturniidae | Citheronia | regalis | (Fabricius) | *Immature called hickory horned devil |
| relapsing fever tick | Ornithodoros turicata (Dugès) | ACARI | Argasidae | Ornithodoros | turicata | (Dugès) | |
| resplendent shield bearer | Coptodisca splendoriferella (Clemens) | LEPIDOPTERA | Heliozelidae | Coptodisca | splendoriferella | (Clemens) | |
| reticulate mite | Lorryia reticulata (Oudemans) | ACARI | Tydeidae | Lorryia | reticulata | (Oudemans) | |
| reticulatewinged trogiid | Lepinotus reticulatus Enderlein | PSOCOPTERA | Trogiidae | Lepinotus | reticulatus | Enderlein | |
| rhinoceros beetle | Xyloryctes jamaicensis (Drury) | COLEOPTERA | Scarabaeidae | Xyloryctes | jamaicensis | (Drury) | |
| Rhodesgrass mealybug | Antonina graminis (Maskell) | HEMIPTERA | Pseudococcidae | Antonina | graminis | (Maskell) | |
| rhododendron borer | Synanthedon rhododendri (Beutenm | LEPIDOPTERA | Sesiidae | Synanthedon | rhododendri | (Beutenm | |
| rhododendron gall midge | Clinodiplosis rhododendri (Felt) | DIPTERA | Cecidomyiidae | Clinodiplosis | rhododendri | (Felt) | |
| rhododendron lace bug | Stephanitis rhododendri Horvath | HEMIPTERA | Tingidae | Stephanitis | rhododendri | Horvath | |
| rhododendron whitefly | Dialeurodes chittendeni Laing | HEMIPTERA | Aleyrodidae | Dialeurodes | chittendeni | Laing | |
| rhubarb curculio | Lixus concavus Say | COLEOPTERA | Curculionidae | Lixus | concavus | Say | |
| ribbed pine borer | Rhagium inquisitor (Linnaeus) | COLEOPTERA | Cerambycidae | Rhagium | inquisitor | (Linnaeus) | |
| rice delphacid | Tagosodes orizicolus (Muir) | HEMIPTERA | Delphacidae | Tagosodes | orizicolus | (Muir) | |
| rice leaffolder | Lerodea eufala (Edwards) | LEPIDOPTERA | Hesperiidae | Lerodea | eufala | (Edwards) | |
| rice leafhopper | Nephotettix nigropictus (Stål) | HEMIPTERA | Cicadellidae | Nephotettix | nigropictus | (Stål) | |
| rice moth | Corcyra cephalonica (Stainton) | LEPIDOPTERA | Pyralidae | Corcyra | cephalonica | (Stainton) | |
| rice root aphid | Rhopalosiphum rufiabdominale (Sasaki) | HEMIPTERA | Aphididae | Rhopalosiphum | rufiabdominale | (Sasaki) | |
| rice stalk borer | Chilo plejadellus Zincken | LEPIDOPTERA | Crambidae | Chilo | plejadellus | Zincken | |
| rice stink bug | Oebalus pugnax (Fabricius) | HEMIPTERA | Pentatomidae | Oebalus | pugnax | (Fabricius) | |
| rice water weevil | Lissorhoptrus oryzophilus Kuschel | COLEOPTERA | Curculionidae | Lissorhoptrus | oryzophilus | Kuschel | |
| rice weevil | Sitophilus oryzae (Linnaeus) | COLEOPTERA | Curculionidae | Sitophilus | oryzae | (Linnaeus) | |
| ridgewinged fungus beetle | Thes bergrothi (Reitter) | COLEOPTERA | Lathridiidae | Thes | bergrothi | (Reitter) | |
| ringlegged earwig | Euborellia annulipes (Lucas) | DERMAPTERA | Labiduridae | Euborellia | annulipes | (Lucas) | |
| robust leafhopper | Penestrangania robusta (Uhler) | HEMIPTERA | Cicadellidae | Penestrangania | robusta | (Uhler) | |
| Rocky Mountain grasshopper | Melanoplus spretus (Walsh) | ORTHOPTERA | Acrididae | Melanoplus | spretus | (Walsh) | |
| Rocky Mountain maple felt mite | Eriophyes calaceris (Keifer) | ACARI | Eriophyidae | Eriophyes | calaceris | (Keifer) | |
| Rocky Mountain wood tick | Dermacentor andersoni Stiles | ACARI | Ixodidae | Dermacentor | andersoni | Stiles | |
| Rohwer’s pinyon sawfly | Zadiprion rohweri (Middleton) | HYMENOPTERA | Diprionidae | Zadiprion | rohweri | (Middleton) | |
| rose aphid | Macrosiphum rosae (Linnaeus) | HEMIPTERA | Aphididae | Macrosiphum | rosae | (Linnaeus) | |
| rose chafer | Macrodactylus subspinosus (Fabricius) | COLEOPTERA | Scarabaeidae | Macrodactylus | subspinosus | (Fabricius) | |
| rose curculio | Merhynchites bicolor (Fabricius) | COLEOPTERA | Attelabidae | Merhynchites | bicolor | (Fabricius) | |
| rose leaf beetle | Brachypnoea puncticollis (Say) | COLEOPTERA | Chrysomelidae | Brachypnoea | puncticollis | (Say) | |
| rose leafhopper | Edwardsiana rosae (Linnaeus) | HEMIPTERA | Cicadellidae | Edwardsiana | rosae | (Linnaeus) | |
| rose midge | Dasineura rhodophaga (Coquillett) | DIPTERA | Cecidomyiidae | Dasineura | rhodophaga | (Coquillett) | |
| rose scale | Aulacaspis rosae (Bouché) | HEMIPTERA | Diaspididae | Aulacaspis | rosae | (Bouché) | |
| rose stem girdler | Agrilus aurichalceus Redtenbacher | COLEOPTERA | Buprestidae | Agrilus | aurichalceus | Redtenbacher | |
| roseroot gall wasp | Diplolepis radicum (Osten Sacken) | HYMENOPTERA | Cynipidae | Diplolepis | radicum | (Osten Sacken) | |
| roseslug | Endelomyia aethiops (Fabricius) | HYMENOPTERA | Tenthredinidae | Endelomyia | aethiops | (Fabricius) | |
| rosy apple aphid | Dysaphis plantaginea (Passerini) | HEMIPTERA | Aphididae | Dysaphis | plantaginea | (Passerini) | |
| rosy predator snail | Euglandina rosea (Förster) | STYLOMMATOPHORA | Spiraxidae | Euglandina | rosea | (Förster) | |
| rotund tick | Ixodes kingi Bishopp | ACARI | Ixodidae | Ixodes | kingi | Bishopp | |
| rough harvester ant | Pogonomyrmex rugosus Emery | HYMENOPTERA | Formicidae | Pogonomyrmex | rugosus | Emery | |
| rough stink bug | Brochymena quadripustulata (Fabricius) | HEMIPTERA | Pentatomidae | Brochymena | quadripustulata | (Fabricius) | |
| rough strawberry root weevil | Otiorhynchus rugosostriarus (Goeze) | COLEOPTERA | Curculionidae | Otiorhynchus | rugosostriarus | (Goeze) | |
| roughskinned cutworm | Proxenus mindara (Barnes & McDunnough) | LEPIDOPTERA | Noctuidae | Proxenus | mindara | (Barnes & McDunnough) | |
| roundheaded appletree borer | Saperda candida Fabricius | COLEOPTERA | Cerambycidae | Saperda | candida | Fabricius | |
| roundheaded cone borer | Paratimia conicola Fisher | COLEOPTERA | Cerambycidae | Paratimia | conicola | Fisher | |
| roundheaded fir borer | Tetropium abietis Fall | COLEOPTERA | Cerambycidae | Tetropium | abietis | Fall | |
| roundheaded pine beetle | Dendroctonus adjunctus Blandford | COLEOPTERA | Curculionidae | Dendroctonus | adjunctus | Blandford | |
| rugose spiraling whitefly | Aleurodicus rugioperculatus Martin | HEMIPTERA | Aleyrodidae | Aleurodicus | rugioperculatus | Martin | |
| Russian wheat aphid | Diuraphis noxia (Kurdjumov) | HEMIPTERA | Aphididae | Diuraphis | noxia | (Kurdjumov) | |
| rustic borer | Xylotrechus colonus (Fabricius) | COLEOPTERA | Cerambycidae | Xylotrechus | colonus | (Fabricius) | |
| rusty banded aphid | Dysaphis apiifolia (Theobald) | HEMIPTERA | Aphididae | Dysaphis | apiifolia | (Theobald) | |
| rusty grain beetle | Cryptolestes ferrugineus (Stephens) | COLEOPTERA | Laemophloeidae | Cryptolestes | ferrugineus | (Stephens) | |
| rusty millipede | Trigoniulus lumbricinus (Gerst) | SPIROBOLIDA | Pachybolidae | Trigoniulus | lumbricinus | (Gerst) | |
| rusty patched bumble bee | Bombus affinis (Cresson) | HYMENOPTERA | Apidae | Bombus | affinis | (Cresson) | |
| rusty plum aphid | Hysteroneura setariae (Thomas) | HEMIPTERA | Aphididae | Hysteroneura | setariae | (Thomas) | |
| rusty tussock moth | Orgyia antiqua (Linnaeus) | LEPIDOPTERA | Lymantriidae | Orgyia | antiqua | (Linnaeus) | |
| saddleback caterpillar | Sibine stimulea (Clemens) | LEPIDOPTERA | Limacodidae | Sibine | stimulea | (Clemens) | |
| saddled leafhopper | Colladonus clitellarius (Say) | HEMIPTERA | Cicadellidae | Colladonus | clitellarius | (Say) | |
| saddled prominent | Heterocampa guttivitta (Walker) | LEPIDOPTERA | Notodontidae | Heterocampa | guttivitta | (Walker) | |
| sagebrush defoliator | Aroga websteri Clarke | LEPIDOPTERA | Gelechiidae | Aroga | websteri | Clarke | |
| Salt Creek tiger beetle | Cicindela nevadica lincolniana Casey | COLEOPTERA | Carabidae | Cicindela nevadica | lincolniana | Casey | |
| saltmarsh caterpillar | Estigmene acrea (Drury) | LEPIDOPTERA | Arctiidae | Estigmene | acrea | (Drury) | |
| saltmarsh mosquito | Aedes sollicitans (Walker) | DIPTERA | Culicidae | Aedes | sollicitans | (Walker) | |
| San Bruno elfin | Incisalia fotis bayensis (R.M. Brown) | LEPIDOPTERA | Lycaenidae | Incisalia | fotis bayensis | (R.M. Brown) | |
| San Jose scale | Quadraspidiotus perniciosus (Comstock) | HEMIPTERA | Diaspididae | Quadraspidiotus | perniciosus | (Comstock) | |
| sand wireworm | Horistonotus uhlerii Horn | COLEOPTERA | Elateridae | Horistonotus | uhlerii | Horn | |
| sandcherry weevil | Coccotorus hirsutus Bruner | COLEOPTERA | Curculionidae | Coccotorus | hirsutus | Bruner | |
| Sanderson bumble bee | Bombus sandersoni (Franklin) | HYMENOPTERA | Apidae | Bombus | sandersoni | (Franklin) | |
| sapwood timberworm | Hylecoetus lugubris Say | COLEOPTERA | Lymexylidae | Hylecoetus | lugubris | Say | |
| Saratoga spittlebug | Aphrophora saratogensis (Fitch) | HEMIPTERA | Cercopidae | Aphrophora | saratogensis | (Fitch) | |
| Saskatoon borer | Saperda candida bipunctata Hopping | COLEOPTERA | Cerambycidae | Saperda | candida bipunctata | Hopping | |
| satin moth | Leucoma salicis (Linnaeus) | LEPIDOPTERA | Lymantriidae | Leucoma | salicis | (Linnaeus) | |
| Saunders embiid | Oligotoma saundersii (Westwood) | EMBIIDINA | Oligotomidae | Oligotoma | saundersii | (Westwood) | |
| sawtoothed grain beetle | Oryzaephilus surinamensis (Linnaeus) | COLEOPTERA | Silvanidae | Oryzaephilus | surinamensis | (Linnaeus) | |
| Say blister beetle | Lytta sayi (LeConte) | COLEOPTERA | Meloidae | Lytta | sayi | (LeConte) | |
| Say stink bug | Chlorochroa sayi (Stål) | HEMIPTERA | Pentatomidae | Chlorochroa | sayi | (Stål) | |
| scab mite | Psoroptes equi (Raspail) | ACARI | Psoroptidae | Psoroptes | equi | (Raspail) | |
| scaly grain mite | Suidasia nesbitti Hughes | ACARI | Acaridae | Suidasia | nesbitti | Hughes | |
| scalyleg mite | Knemidokoptes mutans (Robin & Lanquetin) | ACARI | Sarcoptidae | Knemidokoptes | mutans | (Robin & Lanquetin) | |
| scarlet oak sawfly | Caliroa quercuscoccineae (Dyar) | HYMENOPTERA | Tenthredinidae | Caliroa | quercuscoccineae | (Dyar) | |
| Schaus swallowtail | Papilio aristodemus ponceanus Schaus | LEPIDOPTERA | Papilionidae | Papilio | aristodemus ponceanus | Schaus | |
| Schoene spider mite | Tetranychus schoenei McGregor | ACARI | Tetranychidae | Tetranychus | schoenei | McGregor | |
| screwworm | Cochliomyia hominivorax (Coquerel) | DIPTERA | Calliphoridae | Cochliomyia | hominivorax | (Coquerel) | |
| sculptured pine borer | Chalcophora angulicollis (LeConte) | COLEOPTERA | Buprestidae | Chalcophora | angulicollis | (LeConte) | |
| scurfy scale | Chionaspis furfura (Fitch) | HEMIPTERA | Diaspididae | Chionaspis | furfura | (Fitch) | |
| secondary screwworm | Cochliomyia macellaria (Fabricius) | DIPTERA | Calliphoridae | Cochliomyia | macellaria | (Fabricius) | |
| seedcorn beetle | Stenolophus lecontei (Chaudoir) | COLEOPTERA | Carabidae | Stenolophus | lecontei | (Chaudoir) | |
| seedcorn maggot | Delia platura (Meigen) | DIPTERA | Anthomyiidae | Delia | platura | (Meigen) | |
| sequoia pitch moth | Synanthedon sequoiae (Hy. Edwards) | LEPIDOPTERA | Sesiidae | Synanthedon | sequoiae | (Hy. Edwards) | |
| serpentine leafminer | Liriomyza brassicae (Riley) | DIPTERA | Agromyzidae | Liriomyza | brassicae | (Riley) | |
| sesbania clown weevil | Eudiagogus pulcher Fahraeus | COLEOPTERA | Curculionidae | Eudiagogus | pulcher | Fåhraeus | |
| sevenspotted lady beetle | Coccinella septempunctata Linnaeus | COLEOPTERA | Coccinellidae | Coccinella | septempunctata | Linnaeus | |
| shaft louse | Menopon gallinae (Linnaeus) | PHTHIRAPTERA | Menoponidae | Menopon | gallinae | (Linnaeus) | |
| shallot aphid | Myzus ascalonicus Doncaster | HEMIPTERA | Aphididae | Myzus | ascalonicus | Doncaster | |
| sheep biting louse | Bovicola ovis (Schrank) | PHTHIRAPTERA | Trichodectidae | Bovicola | ovis | (Schrank) | |
| sheep bot fly | Oestrus ovis Linnaeus | DIPTERA | Oestridae | Oestrus | ovis | Linnaeus | |
| sheep follicle mite | Demodex ovis Railliet | ACARI | Demodicidae | Demodex | ovis | Railliet | |
| sheep ked | Melophagus ovinus (Linnaeus) | DIPTERA | Hippoboscidae | Melophagus | ovinus | (Linnaeus) | |
| sheep scab mite | Psoroptes ovis (Hering) | ACARI | Psoroptidae | Psoroptes | ovis | (Hering) | |
| Sheridan’s green hairstreak | Callophrys sheridanii (W. H. Edwards) | LEPIDOPTERA | Lycaenidae | Callophrys | sheridanii | (W. H. Edwards) | |
| shieldbacked pine seed bug | Tetyra bipunctata (Herrich-Schäffer) | HEMIPTERA | Scutelleridae | Tetyra | bipunctata | (Herrich-Schäffer) | |
| shortleaf pine cone borer | Eucosma cocana Kearfott | LEPIDOPTERA | Tortricidae | Eucosma | cocana | Kearfott | |
| shortnosed cattle louse | Haematopinus eurysternus (Nitzsch) | PHTHIRAPTERA | Haematopinidae | Haematopinus | eurysternus | (Nitzsch) | |
| shortwinged mole cricket | Scapteriscus abbreviatus Scudder | ORTHOPTERA | Gryllotalpidae | Scapteriscus | abbreviatus | Scudder | |
| shothole borer | Scolytus rugulosus (Müller) | COLEOPTERA | Curculionidae | Scolytus | rugulosus | (Müller) | |
| Sigmoid fungus beetle | Cryptophagus varus Woodroffe & Coombs | COLEOPTERA | Cryptophagidae | Cryptophagus | varus | Woodroffe & Coombs | |
| silkworm | Bombyx mori (Linnaeus) | LEPIDOPTERA | Bombycidae | Bombyx | mori | (Linnaeus) | |
| silky ant | Formica fusca Linnaeus | HYMENOPTERA | Formicidae | Formica | fusca | Linnaeus | |
| silky cane weevil | Metamasius hemipterus sericeus (Olivier) | COLEOPTERA | Curculionidae | Metamasius | hemipterus sericeus | (Olivier) | |
| silver fir beetle | Pseudohylesinus sericeus (Mannerheim) | COLEOPTERA | Curculionidae | Pseudohylesinus | sericeus | (Mannerheim) | |
| silverfish | Lepisma saccharina Linnaeus | THYSANURA | Lepismatidae | Lepisma | saccharina | Linnaeus | |
| silverspotted skipper | Epargyreus clarus (Cramer) | LEPIDOPTERA | Hesperiidae | Epargyreus | clarus | (Cramer) | |
| silverspotted tiger moth | Lophocampa argentata (Packard) | LEPIDOPTERA | Arctiidae | Lophocampa | argentata | (Packard) | |
| sinuate lady beetle | Hippodamia sinuata Mulsant | COLEOPTERA | Coccinellidae | Hippodamia | sinuata | Mulsant | |
| sinuate peartree borer | Agrilus sinuatus (Oliver) | COLEOPTERA | Buprestidae | Agrilus | sinuatus | (Oliver) | |
| Sitka bumble bee | Bombus sitkensis Nylander | HYMENOPTERA | Apidae | Bombus | sitkensis | Nylander | |
| Sitka spruce weevil* | Pissodes strobi (Peck) | COLEOPTERA | Curculionidae | Pissodes | strobi | (Peck) | *Also called Englemann spruce weevil and white pine weevil |
| sixspined ips | Ips calligraphus (Germar) | COLEOPTERA | Curculionidae | Ips | calligraphus | (Germar) | |
| sixspotted mite | Eotetranychus sexmaculatus (Riley) | ACARI | Tetranychidae | Eotetranychus | sexmaculatus | (Riley) | |
| sixspotted thrips | Scolothrips sexmaculatus (Pergande) | THYSANOPTERA | Thripidae | Scolothrips | sexmaculatus | (Pergande) | |
| slash pine flower thrips | Gnophothrips fuscus (Morgan) | THYSANOPTERA | Phlaeothripidae | Gnophothrips | fuscus | (Morgan) | |
| slash pine sawfly | Neodiprion merkeli Ross | HYMENOPTERA | Diprionidae | Neodiprion | merkeli | Ross | |
| slash pine seedworm | Cydia anaranjada (Miller) | LEPIDOPTERA | Tortricidae | Cydia | anaranjada | (Miller) | |
| slender duck louse | Anaticola crassicornis (Scopoli) | PHTHIRAPTERA | Philopteridae | Anaticola | crassicornis | (Scopoli) | |
| slender goose louse | Anaticola anseris (Linnaeus) | PHTHIRAPTERA | Philopteridae | Anaticola | anseris | (Linnaeus) | |
| slender guinea louse | Lipeurus numidae (Denny) | PHTHIRAPTERA | Philopteridae | Lipeurus | numidae | (Denny) | |
| slender guineapig louse | Gliricola porcelli (Schrank) | PHTHIRAPTERA | Gyropidae | Gliricola | porcelli | (Schrank) | |
| slender pigeon louse | Columbicola columbae (Linnaeus) | PHTHIRAPTERA | Philopteridae | Columbicola | columbae | (Linnaeus) | |
| slender seedcorn beetle | Clivina impressifrons LeConte | COLEOPTERA | Carabidae | Clivina | impressifrons | LeConte | |
| slender turkey louse | Oxylipeurus polytrapezius (Burmeister) | PHTHIRAPTERA | Philopteridae | Oxylipeurus | polytrapezius | (Burmeister) | |
| slenderhorned flour beetle | Gnatocerus maxillosus (Fabricius) | COLEOPTERA | Tenebrionidae | Gnatocerus | maxillosus | (Fabricius) | |
| small chestnut weevil | Curculio sayi (Gyllenhal) | COLEOPTERA | Curculionidae | Curculio | sayi | (Gyllenhal) | |
| small hive beetle | Aethina tumida (Murray) | COLEOPTERA | Nitidulidae | Aethina | tumida | (Murray) | |
| small milkweed bug | Lygaeus kalmii Stäl | HEMIPTERA | Lygaeidae | Lygaeus | kalmii | Stål | |
| small pigeon louse | Campanulotes bidentatus compar (Burmeister) | PHTHIRAPTERA | Philopteridae | Campanulotes | bidentatus compar | (Burmeister) | |
| small southern pine engraver | Ips avulsus (Eichhoff) | COLEOPTERA | Curculionidae | Ips | avulsus | (Eichhoff) | |
| small spruce bud scale | Physokermes hemicryphus (Dalman) | HEMIPTERA | Coccidae | Physokermes | hemicryphus | (Dalman) | |
| smaller European elm bark beetle | Scolytus multistriatus (Marsham) | COLEOPTERA | Curculionidae | Scolytus | multistriatus | (Marsham) | |
| smaller Hawaiian cutworm | Diarsia dislocata (Walker) | LEPIDOPTERA | Noctuidae | Diarsia | dislocata | (Walker) | |
| smaller lantana butterfly | Strymon bazochii (Bates) | LEPIDOPTERA | Lycaenidae | Strymon | bazochii | (Bates) | |
| smaller Mexican pine beetle | Dendroctonus mexicanus Hopkins | COLEOPTERA | Curculionidae | Dendroctonus | mexicanus | Hopkins | |
| smaller rice leafminer | Hydrellia griseola Fall | DIPTERA | Ephydridae | Hydrellia | griseola | Fall | |
| smaller yellow ant | Acanthomyops claviger (Roger) | HYMENOPTERA | Formicidae | Acanthomyops | claviger | (Roger) | |
| smalleyed flour beetle | Palorus ratzeburgii (Wissmann) | COLEOPTERA | Tenebrionidae | Palorus | ratzeburgii | (Wissmann) | |
| smartweed borer | Ostrinia obumbratalis (Lederer) | LEPIDOPTERA | Crambidae | Ostrinia | obumbratalis | (Lederer) | |
| smeared dagger moth | Acronicta oblinita (J.E. Smith) | LEPIDOPTERA | Noctuidae | Acronicta | oblinita | (J.E. Smith) | |
| Smith blue | Euphilotes enoptes smithi (Mattoni) | LEPIDOPTERA | Lycaenidae | Euphilotes | enoptes smithi | (Mattoni) | |
| smokybrown cockroach | Periplaneta fuliginosa (Serville) | BLATTODEA | Blattidae | Periplaneta | fuliginosa | (Serville) | |
| smut beetle | Phalacrus politus Melsheimer | COLEOPTERA | Phalacridae | Phalacrus | politus | Melsheimer | |
| snowball aphid | Ceruaphis viburnicola (Gillette) | HEMIPTERA | Aphididae | Ceruaphis | viburnicola | (Gillette) | |
| snowy tree cricket | Oecanthus fultoni Walker | ORTHOPTERA | Oecanthidae | Oecanthus | fultoni | Walker | |
| solanaceous treehopper | Antianthe expansa (Germar) | HEMIPTERA | Membracidae | Antianthe | expansa | (Germar) | |
| solitary oak leafminer | Cameraria hamadryadella (Clemens) | LEPIDOPTERA | Gracillariidae | Cameraria | hamadryadella | (Clemens) | |
| sonchus fly | Ensina sonchi (Linnaeus) | DIPTERA | Tephritidae | Ensina | sonchi | (Linnaeus) | |
| Sonoran bumble bee | Bombus pensylvanicus subsp. sonorus Say | HYMENOPTERA | Apidae | Bombus | pensylvanicus subsp. sonorus | Say | |
| Sonoran tent caterpillar | Malacosoma tigris (Dyar) | LEPIDOPTERA | Lasiocampidae | Malacosoma | tigris | (Dyar) | |
| sorghum midge | Contarinia sorghicola (Coquillett) | DIPTERA | Cecidomyiidae | Contarinia | sorghicola | (Coquillett) | |
| sorghum shoot fly | Atherigona soccata (Rondani) | DIPTERA | Muscidae | Atherigona | soccata | (Rondani) | |
| sorghum webworm | Nola sorghiella Riley | LEPIDOPTERA | Nolidae | Nola | sorghiella | Riley | |
| sourbush seed fly | Acinia picturata (Snow) | DIPTERA | Tephritidae | Acinia | picturata | (Snow) | |
| South African emex weevil | Apion antiquum Gyllenhal | COLEOPTERA | Brentidae | Perapion | antiquum | Gyllenhal | |
| South American rice miner | Hydrellia wirthi Korytkowski | DIPTERA | Ephydridae | Hydrellia | wirthi | Korytkowski | |
| south coastal coneworm | Dioryctria ebeli Mutuura & Munroe | LEPIDOPTERA | Pyralidae | Dioryctria | ebeli | Mutuura & Munroe |