| Subject | English | Latin |
| mamm. | American western pipistrelle | Pipistrellus hesperus |
| reptil. | common western skink | Eumeces skiltonianus |
| reptil. | greater western skink | Eumeces giiberti |
| life.sc., environ. | noisy scrub-bird, Western scrub-bird | Atrichornis clamosus |
| reptil. | north-western garter snake | Thamnophis ordinoides |
| zool. | North-Western marsupial mole | Notoryctes caurinus |
| reptil. | north-western red-faced tortoise | Emydura aurantiaca |
| reptil. | north-western salamander | Ambystoma gracile |
| nat.sc., agric. | pale western cutworm | Porosagrotis delorata |
| nat.sc., agric. | pale western cutworm | Agrotis orthogonia |
| nat.sc., agric. | pale western cutworm | Porosagrotis orthogonia |
| nat.sc., agric. | pale western cutworm | Agrotis delorata |
| entomol. | pale western moth | Agrotis orthogonia |
| zool. | South-Western pigmy phalanger | Cercaúrtus concinnus |
| mamm. | south-western pygmy phalanger | Cercartetus concinnus |
| reptil. | south-western toad | Bufo microscaphus |
| zool. | Western African brush-tailed porcupine | Atherurus africanus |
| zool. | Western African striped squirrel | Funisciurus lemniscatus |
| forestr. | western alder | Alnus oregona |
| forestr. | western alder | Alnus rubra |
| mamm. | western American mole | Scapanus orarius |
| zool. | Western American moles | Scapanus |
| reptil. | western aquatic garter snake | Thamnophis couchi |
| biol. | western arborvitae | Thuja plicata D. Don |
| ichtyol. | Western Atlantic brief squid | Lolliguncula brevis |
| ichtyol. | Western Atlantic pomfret | Brama caribbea |
| ichtyol. | Western Atlantic seabream | Archosargus rhomboidalis |
| ichtyol. | Western Australia pigfish | Bodianus vulpinus |
| entomol. | Western Australian brown blowfly | Calliphora albifrontalis |
| mamm. | Western Australian fur seal | Arctocephalus forsteri |
| zool. | Western baboon | Papio papio |
| entomol. | western balsam bark beetle | Dryocoetes confusus |
| biol. | western balsam bark beetle | Dryocoetes confusus Swaine |
| entomol. | western balsam fir beetle | Dryocoetes confusus |
| nat.res., agric. | Western Balsam Poplar | Populus trichocarpa |
| reptil. | western banded gecko | Coleonyx Varanus |
| reptil. | western banjo frog | Limnodynastes Dogania |
| mamm. | western barbastelle | Barbastella barbastellus |
| nat.res. | western barred bandicoot | Perameles bougainville |
| environ., nat.res. | Western barred bandicoot | Perameles bougainville |
| mamm. | western barred bandicoot | Perameles bougainvillei |
| entomol. | western bean noctuid moth | Loxagrotis albicosta |
| reptil. | western bearded dragon | Amphibolurus minimus |
| nat.res. | western bearded greenbul | Criniger barbatus |
| ornit. | western bearded scrub robin | Cercotrichas leucosticta |
| ornit. | western bearded scrub robin | Cercotrichas barbata |
| mamm. | western big-eared bat | Plecotus townsendii |
| entomol. | western black flea beetle | Phyllotreta ramosa |
| entomol. | western black flea beetle | Phyllotreta pusilla |
| reptil. | western black tree snake | Thrasops Ithycyphus |
| mamm. | western black-and-white colobus | Colobus polykomos |
| zool. | Western black-and-white colobus | Colobus polykomos |
| environ., nat.res., agric. | western black-headed budworm | Acleris gloverana |
| nat.sc., agric. | western blackheaded budworm | Acleris gloveranaWalsingham |
| nat.sc., agric. | western blackheaded budworm | Acleris gloverana |
| ornit. | western black-headed oriole | Oriolus brachyrhynchus |
| zool. | Western black-headed oriole | Oriolus brachyrhynchus |
| reptil. | western black-headed snake | Tantilla Plagiopholis |
| entomol. | western black-headed tortricid | Acalla gloverana |
| reptil. | western black-naped snake | Neelaps Bedriagaia |
| reptil. | western black-striped snake | Neelaps calonotus |
| biol. | western bleeding-heart | Dicentra formosa Walp. |
| reptil. | western blind snake | Leptotyphlops Hormonotus |
| entomol. | western bloodsucking conenose | Triatoma protracta |
| biol. | western bloodsucking conenose | Triatoma protracta (Uhler) |
| ichtyol. | western blue groper | Achoerodus gouldii |
| ornit. | western blue-bill | Spermophaga haematina |
| nat.res. | western bluebill | Spermophaga haematina |
| zool. | Western bluebill | Spermophaga haematina |
| ornit. | western bluebird | Sialia mexicana |
| zool. | Western bluebird | Sialia mexicana |
| environ., nat.res. | Western blue-flag | Iris missouriensis |
| reptil. | western blue-tongued lizard | Tiliqua Occidozyga |
| reptil. | western blue-tongued skink | Tiliqua Occidozyga |
| zool. | Western Bonelli's warbler | Phylloscopus bonelli bonelli |
| ichtyol. | western bottlenose | Mormyrus lacerda |
| zool. | Western bowerbird | Chlamydera guttata |
| reptil. | western box turtle | Terrapene Orlitia |
| entomol. | western box-elder bug | Leptocoris rubrolineatus |
| ornit. | western bristlebird | Dasyornis longirostris |
| nat.res. | Western bristlebird | Dasyornis brachypterus longirostris |
| zool. | Western bristlebird | Dasyornis longirostris |
| life.sc., environ. | Western rufous bristlebird, long-billed bristlebird | Dasyornis longirostris |
| environ., nat.res. | western bronze-naped pigeon | Turturoena iriditorques |
| environ., nat.res. | western bronze-naped pigeon | Columba iriditorques |
| zool. | Western bronze-naped pigeon | Columba iriditorques |
| ichtyol. | western brook lamprey | Lampetra richardsoni |
| ichtyol. | western brook lamprey | Lampetra planeri |
| reptil. | western brown frog | Crinia signifera |
| reptil. | western brown snake | Pseudonaja Nototriton |
| biol. | western brown stink bug | Euschistus impictiventris Stal |
| biol. | western brown stink bug | Euschistus impictiventris Stal. |
| entomol. | western brown stinkbug | Euschistus impictiventris |
| mamm. | western brush wallaby | Macropus irma |
| biol. | western burningbush | Euonymus occidentalis Nott. |
| entomol. | Western cabbage worm | Pieris occidentalis |
| zool. | Western capercaillie | Tetrao urogallus |
| biol. | western catalpa | Catalpa speciosa Ward. |
| biol. | western cedar | Juniperus occidentalis Hook. |
| entomol. | western cedar bark beetle | Phloeosinus punctatus |
| entomol. | western cedar borer | Trachykele blondeli |
| biol. | western celery mosaic virus | Marmor umbelliferarum (Holmes) |
| biol. | western celery mosaic virus | Apium virus 1 (Smith) |
| ornit. | western Chapman's antshrike | Thamnomanes occidentalis |
| zool. | Western chat-tanager | Calyptophilus frugivorus tertius |
| entomol. | western cherry fruit fly | Rhagoletis indifferens |
| biol. | western cherry fruit fly | Rhagoletis indifferens Curran |
| mamm. | western chestnut mouse | Pseudomys nanus |
| entomol. | western chicken flea | Ceratophyllus niger |
| biol. | western chicken flea | Ceratophyllus niger Fex. |
| gen. | western chimpanzee | Pan troglodytes verus |
| entomol. | western chinch bug | Blissus occiduus |
| biol. | western chinch bug | Blissus occiduus Barber |
| mamm. | western chipmunk | Tamias minimus |
| zool. | Western chipmunks | Eutamias |
| reptil. | western chorus frog | Pseudacris triseriata |
| zool. | Western citril | Serinus frontalis, Serinus frontalis frontalis |
| entomol. | western click beetle | Agriotes sparsus |
| biol. | western com rootworm | Diabrotica virgifera LeConte |
| reptil. | western coral snakes | Micruroides |
| zool. | Western corella | Cacatua pastinator |
| entomol. | western corn rootworm | Diabrotica virgifera |
| ornit. | western crowned leaf warbler | Phylloscopus occipitalis |
| reptil. | western crowned snake | Meizodon coronatus |
| zool. | Western crowned-pigeon | Goura cristata |
| zool. | Western crowned-warbler | Phylloscopus occipitalis |
| mamm. | western dasyure | Dasyurus geoffroyi |
| zool. | Western dasyure | Dasyurus Dasyurinus geoffroyi |
| reptil. | western diamond-back rattlesnake | Crotalus Atretium |
| ornit. | western dusky babbler | Turdoides reinwardtii |
| nat.sc., agric. | western dwarf mistletoe | Arceuthobium campylopodum |
| nat.res. | Western European Hedgehog | Erinaceus europaeus |
| mamm. | western European hedgehog | Erinaceus europaeus |
| zool. | Western European hedgehog | Erinaceus europaeus |
| reptil. | western fence lizard | Sceloporus Ocadia |
| nat.res. | western fence lizard | Sceloporus occidentalis |
| entomol. | western field click beetle | Limonius infuscatus |
| entomol. | western flower thrips | Frankliniella occidentalis |
| biol. | western flower thrips | Frankliniella occidentalis (Pergande) |
| biol. | western flower thrips | Frankliniella occidentalis Pergande |
| ornit. | western flycatcher | Empidonax difficilis |
| reptil. | western foam-nest tree frog | Chiromantis Ristella |
| ichtyol. | western footballer | Neatypus obliquus |
| reptil. | western forest burrowing adder | Atractaspis aterrima |
| reptil. | western forest centipede-eater | Aparallactus modestus |
| reptil. | western forest egg-eater | Dasypeltis fasciata |
| reptil. | western forest file snake | Mehelya poensis |
| ichtyol. | western frogfish | Batrachomoeus occidentalis |
| entomol. | western fruit lecanium | Lecanium tililae |
| nat.sc., agric. | western fruit lecanium | Lecanium coryli |
| nat.sc., agric. | western fruit lecanium | Lecanium tiliae |
| nat.sc., agric. | western fruit lecanium | Eulecanium tiliae |
| nat.sc., agric. | western fruit lecanium | Eulecanium coryli |
| nat.sc., agric. | western fruit lecanium | Physokermes coryli |
| ichtyol. | western galaxias | Galaxias occidentalis |
| reptil. | western garter snake | Elapsoidea Grayia |
| zool. | Western gerygone | Gerygone fusca |
| ornit. | western gerygone warbler | Gerygone fusca |
| ichtyol. | western gizzard shad | Dorosoma smithi |
| zool. | Western golden myna | Mino anais anais |
| ornit. | western golden weaver | Sitagra subpersonata |
| ornit. | western golden weaver | Ploceus subpersonatus |
| ornit. | western golden-backed woodpecker | Campethera maculosa |
| reptil. | western gopher tortoise | Gopherus agassizii |
| entomol. | western grape leaf skeletonizer | Harrisina brillians |
| entomol. | western grape root beetle | Adoxus obscums |
| entomol. | Western grape root worm | Adoxus obscurus L. |
| agric. | western grape root worm | Bromius obscurus |
| agric. | western grape root worm | Schreiber |
| agric. | western grape root worm | Eumolpus vitis |
| agric. | western grape root worm | Adoxus obscurus var. villosulus |
| nat.sc., agric. | western grape rootworm | Bromius obscurus |
| nat.sc., agric. | western grape rootworm | Adoxus obscurus vitis |
| nat.sc., agric. | western grape rootworm | Eumolpus obscurus |
| nat.sc., agric. | western grape rootworm | Adoxus obscurus villosulus |
| nat.sc., agric. | western grape rootworm | Adoxus obscurus |
| agric. | Western grape rootworm | Adoxus obscurus |
| agric. | Western grape rootworm | Bromius obscurus |
| biol. | western grape rootworm | Bromius obscurus (Linnaeus) |
| biol. | western grapeleaf skeletonizer | Harrisina brillians Barnes et McDunnough |
| ornit. | western grass wren | Amytornis textilis |
| zool. | Western grasswren | Amytornis textilis textilis |
| ornit. | western gray-headed puff-back flycatcher | Batis minima |
| ornit. | western grebe | Aechmophorus |
| ornit. | western grebe | Aechmophorus occidentalis |
| zool. | Western grebe | Aechmophorus occidentalis |
| reptil. | western green and golden bell frog | Litoria moorei |
| reptil. | western green snake | Phiiothamnus Iphisa |
| ornit. | western green tinker-barbet | Viridibucco coryphaeus |
| ornit. | western green tinker-barbet | Pogoniulus coryphaeus |
| ornit. | western green tinkerbird | Pogoniulus coryphaeus |
| ornit. | western green tinkerbird | Viridibucco coryphaeus |
| zool. | Western green-tinkerbird | Pogoniulus coryphaeus |
| entomol. | Western grey blister beetle | Epicauta cinerea |
| mamm. | western grey kangaroo | Macropus fuliginosus |
| nat.sc., agric. | western grey plantain-eater | Crinifer piscator |
| zool. | Western grey plantain-eater | Crinifer piscator |
| mamm. | western grey squirrel | Sciurus griseus |
| mamm. | western ground squirrel | Xerus erythropus |
| ornit. | western gull | Larus occidentalis |
| zool. | Western gull | Larus occidentalis |
| nat.sc., agric. | western hackberry | Celtis occidentalis |
| mamm. | western hare wallaby | Lagorchestes hirsutus |
| zool. | Western hare wallaby | Lagorchestes hirsutus |
| nat.res. | Western hare-wallaby | Lagorchestes hirsutus |
| zool. | Western hartebeest | Alcelaphus buselaphus major |
| environ., nat.res. | Western harvest mouse | Reithrodontomys megalotis megalotis |
| mamm. | western harvest mouse | Reithrodontomys megalotis |
| entomol. | western harvester ant | Pogomyrmex occidentalis |
| nat.res. | Western Hedgehog | Erinaceus europaeus |
| forestr. | western hemlock | Tsuga albertiana |
| forestr. | western hemlock | Tsuga heterophylla |
| biol. | western hemlock | Tsuga heterophylla Raf. Sarg. |
| nat.sc., agric. | western hemlock looper | Lambdina fiscellaria lugubrosaHulst |
| nat.sc., agric. | western hemlock looper | Lambdina fiscellaria lugubrosa |
| reptil. | western hog-nosed snake | Heterodon Narudasia |
| nat.res., agric. | western honey-bee | Apis mellifera |
| nat.res., agric. | western honey-bee | Apis mellifica |
| reptil. | western hook-nosed snake | Gyalopion canum |
| environ., nat.res. | Western horned tragopan | Tragopan melanocephalus |
| zool. | Western house mouse | Mus musculus domesticus |
| mamm. | western jumping mouse | Zapus princeps |
| nat.sc., agric. | Western king prawn | Penaeus latisulcatus |
| biol. | western king prawn | Penaeus latisulcatus Kishinouye |
| ornit. | western kingbird | Tyrannus verticalis |
| zool. | Western kingbird | Tyrannus verticalis |
| zool. | Western kob | Kobus kob kob, Adenota kob kob |
| ichtyol. | western lake chub sucker | Erimyzon sucetta |
| ichtyol. | western lamprey | Lampetra ayresi |
| nat.sc., agric. | western larch | Larix occidentalis |
| biol. | western larch | Larix occidentalis Nutt |
| entomol. | Western larch borer | Tetropium velutinum |
| ornit. | western least honeyguide | Indicator exilis |
| zool. | Western lemon-dove | Columba larvata simplex |
| entomol. | western lily aphid | Macrosiphum scoliopi |
| biol. | western lily aphid | Macrosiphum scoliopi Essig |
| ornit. | western long-tailed shrike | Corvinella corvina |
| ornit. | western long-tailed shrike | Corvinella |
| zool. | Western magpie | Gymnorhina tibicen dorsalis |
| zool. | Western marsh harrier | Circus aeruginosus |
| nat.res. | Western marsh-harrier | Circus aeruginosus |
| bot. | western marsh-orchid | Orchis latifolia auct. |
| bot. | western marsh-orchid | Orchis majalis Rchb. |
| bot. | western marsh-orchid | Dactylorchis majalis Rchb. Verm. |
| bot. | western marsh-orchid | Dactylorhiza majalis Rchb. P. F. Hunt & Summerh. |
| zool. | Western marsh-wren | Cistothorus palustris paludicola |
| mamm. | western mastiff bat | Eumops perotis |
| ornit. | western meadowlark | Sturnella neglecta |
| zool. | Western meadowlark | Sturnella neglecta |
| ichtyol. | Western Mexican rangia | Rangia mendica |
| mamm. | western American moles | Scapanus |
| ornit. | western mountain flycatcher | Melaenornis ardesiaca |
| ichtyol. | western mudminnow | Umbra limi |
| mamm. | western naked-backed bat | Dobsonia peroni |
| reptil. | western narrow-mouthed toad | Gastrophryne Oligodon |
| mamm. | western Australian native ceat | Dasyurus geoffroyi |
| mamm. | western needle-clawed bushbaby | Galago elegantulus |
| zool. | Western needle-clawed bushbaby | Galago elegantulus |
| zool. | Western negrofinch | Nigrita canicapilla emiliae |
| reptil. | western netted dragon | Amphibolurus reticulatus |
| mamm. | western nyctophilus | Nyctophilus timoriensis |
| ichtyol. | Western Pacific gizzard shad | Nematalosa come |
| zool. | Western painted-bunting | Passerina ciris ciris |
| ornit. | western parotia | Parotia sefilata |
| zool. | Western parotia | Parotia sefilata |
| ornit. | western parrakeet | Platycercus icterotis |
| reptil. | western patch-nosed snake | Salvadora Heurnia |
| nat.sc., agric. | western peach tree borer | Synanthedon exitiosa |
| nat.sc., agric. | western peach tree borer | Conopia exitiosa |
| entomol. | western peach tree borer | Sanninoidea exitiosa |
| biol. | western peach tree borer | Sanninoidea exitiosa Say |
| ichtyol. | western pearlshell | Margaritifera falcata |
| ornit. | western pied flycatcher | Ficedula hypoleuca |
| entomol. | western pine beetle | Dendroctonus brevicornis |
| nat.sc., agric. | western pine beetle | Dendroctonus brevicomis |
| environ., nat.res. | western pink | Dianthus gallicus |
| mamm. | western pipistrelle | Pipistrellus hesperus |
| entomol. | western plant bug | Lygus hesperus |
| mamm. | western pocket gopher | Thomomys mazama |
| zool. | Western pocket gopher | Thomomys bottae |
| mamm. | western pocket gophers | Thomomys |
| reptil. | western pond turtle | Clemmys Mantipus |
| entomol. | western potato flea beetle | Epithrix subcrinita |
| biol. | western potato flea beetle | Epitrix subcrinita LeConte |
| entomol. | western potato leafhopper | Empoasca abrupta |
| biol. | western potato leafhopper | Empoasca abrupta DeLong |
| environ., nat.res. | Western Prairie fringed orchid | Platanthera praeclara |
| mamm. | western pseudorat | Pseudomys shortridgei |
| ichtyol. | western pygmy perch | Edelia vittata |
| mamm. | western pygmy possum | Cercartetus concinnus |
| ornit. | western pygmy sunbird | Anthreptes platura |
| zool. | Western quail-thrush | Cinclosoma castaneothorax marginatum |
| reptil. | western quill-nosed snake | Xenocalamus mehowii |
| reptil. | western quill-snouted snake | Xenocalamus mehowii |
| nat.res. | Western rabbit bandicoot | Macrotis lagotis |
| mamm. | western rabbit rat | Mesembriomys macrurus |
| zool. | Western rail | Rallus longirostris obsoletus |
| entomol. | western raspberry fruit beetle | Byturus bakeri |
| entomol. | Western raspberry fruitworm | Byturus bakeri |
| pest.contr. | western raspberry rust | Phragmidium imitans |
| reptil. | western rattlesnake | Crotalus Virginia |
| nat.res., agric. | Western red cedar | Libocedrus decurrens |
| nat.res. | western red cedar | Thuja plicata |
| nat.sc., agric. | western red cedar | Libocedrus decurrens |
| zool. | Western red colobus | Colobus badius |
| reptil. | western redback salamander | Plethodom vehiculum |
| reptil. | western redbacked salamander | Plethodom vehiculum |
| reptil. | western red-bellied newt | Taricha Ristella |
| zool. | Western red-legged thrush | Turdus plumbeus plumbeus |
| reptil. | western red-tailed skink | Eumeces rubricaudatus |
| nat.res. | western reef egret | Egretta gularis |
| ornit. | western reef heron | Egretta gularis |
| zool. | Western reef-egret | Egretta gularis |
| reptil. | western ribbon snake | Thamnophis Proteus |
| reptil. | western ringneck snake | Diadophis amabilis |
| reptil. | western ring-necked snake | Diadophis amabilis |
| ichtyol. | Western River Lamprey | Lampetra ayresii |
| ichtyol. | western river prawn | Macrobrachium occidentale |
| ornit. | western rock nuthatch | Sitta neumayer |
| zool. | Western rock nuthatch | Sitta neumayer |
| mamm. | western rock wallaby | Petrogale penicillata |
| ornit. | western rosella | Platycercus icterotis |
| zool. | Western rosella | Platycercus icterotis |
| zool. | Western royal-flycatcher | Onychorhynchus coronatus occidentalis |
| environ., nat.res. | Western rufous bristlebird | Dasyornis broadbenti litoralis |
| nat.res. | Western rufous bristlebird | Dasyornis broadbenti littoralis |
| environ. | Western rufous bristlebird, lesser rufous bristlebird, rufous-headed bristlebird | Dayornis broadbenti litoralis p.e. |
| ichtyol. | western sand darter | Ammocrypta clara |
| reptil. | western sand lizard | Mesalina undata |
| food.ind. | Western sandcherry | Prunus pumila ssp. besseyi |
| ornit. | western sandpiper | Ereunetes mauri |
| ornit. | western sandpiper | Calidris mauri |
| zool. | Western sandpiper | Calidris mauri |
| nat.sc., agric. | Western scaly-bellied green woodpecker | Picus squamatus flavirostris |
| reptil. | western scaly-foot | Pygopus nigrescens |
| ichtyol. | western school shrimp | Metapenaeus dalli |
| nat.sc., agric. | Western school sillago | Sillago bassensis |
| environ., nat.res. | Western screech-owl | Otus kennicottii |
| zool. | Western screech-owl | Otus kennicottii, Otus kennicottii kennicottii |
| ornit. | western scrubbird | Atrichornis clamosus |
| environ., nat.res. | Western scrub-bird | Atrichornis clamosus |
| reptil. | western serpentiform skink | Eumecia Anarbylus |
| ichtyol. | western shovelnose ray | Aptychotrema vincentiana |
| ichtyol. | western shovelnose stingaree | Trygonoptera mucosa |
| reptil. | western shovel-nosed snake | Chionactis occipitalis |
| mamm. | western shrewmouse | Pseudohydromys occidentalis |
| zool. | Western shrike-thrush | Colluricincla harmonica rufiventris |
| zool. | Western shrike-tit | Falcunculus frontatus leucogaster |
| zool. | Western silvereye | Zosterops lateralis gouldi |
| environ., nat.res. | Western silver-leaved aster | Symphyotrichum sericeum |
| ichtyol. | western silvery minnow | Hybognathus argyritis |
| environ., nat.res. | Western silvery minnow | Hybognathus argyritis |
| ornit. | western sky lark | Alauda arvensis |
| zool. | Western slaty-antshrike | Thamnophilus punctatus atrinucha |
| ichtyol. | western small false donax | Heterodonax pacificus |
| mamm. | western small-toothed rat | Macruromys elegans |
| ichtyol. | western smooth boxfish | Anoplocapros amygdaloides |
| nat.sc., agric. | Western softhead grenadier | Malacocephalus occidentalis |
| reptil. | western spadefoot | Scaphiopus hammondii |
| reptil. | western spadefoot | Pelobates Ctenotus |
| reptil. | western spadefoot toad | Scaphiopus hammondii |
| nat.res. | western spadefoot toad | Scaphiopus hammondi |
| environ., nat.res. | Western spiderwort | Tradescantia occidentalis |
| ornit. | western spinebill | Acanthorhynchus superciliosus |
| zool. | Western spinebill | Acanthorhynchus superciliosus |
| reptil. | western spiny-tailed gecko | Diplodactylus spinigerus |
| entomol. | western spotted cucumber beetle | Diabrotica undecimpunctata |
| biol. | western spotted cucumber beetle | Diabrotica undecimpunctata howardi Barber |
| entomol. | western spruce budworm | Choristoneura occidentalis |
| nat.sc., agric. | western spruce budworm | Choristoneura occidentalis Freeman |
| zool. | Western steppe-buzzard | Buteo buteo vulpinus |
| zool. | Western steppe-eagle | Aquila nipalensis orientalis |
| mamm. | western striped bandicoot | Perameles bougainvillei |
| entomol. | western striped cucumber beetle | Acalymma trivittata |
| entomol. | western subterranean termite | Reticulitermes hesperus |
| reptil. | western swamp turtle | Pseudemydura umbrina |
| reptil. | western swamp turtles | Pseudemydura |
| zool. | Western swamphen | Porphyrio porphyrio bellus |
| biol. | western sword-fern | Polystichummunitum Presl. |
| bot. | Western tamarack | Larix occidentalis |
| ornit. | western tanager | Piranga ludoviciana |
| zool. | Western tanager | Piranga ludoviciana |
| mamm. | western tarsier | Tarsius bancanus |
| zool. | Western tarsier | Tarsius bancanus |
| entomol. | Western tent caterpillar | Malacosoma pluviale |
| biol. | western tent caterpillar | Malacosoma californicum Pack. |
| entomol. | western tent lackey | Malacosoma pluviale |
| entomol. | western tent moth | Malacosoma califomicum |
| reptil. | western terrestrial garter snake | Thamnophis Elapsoidea |
| entomol. | western thatching ant | Formica obscuripes |
| biol. | western thatching ant | Formica obscuripes For. |
| ornit. | western thornbill | Acanthiza inornata |
| zool. | Western thornbill | Acanthiza inornata |
| reptil. | western three-striped skink | Mabuya Ocadia |
| reptil. | western tiger snake | Notechis Atelopus |
| reptil. | western toad | Bufo boreas |
| ornit. | western tragopan | Tragopan melanocephalus |
| life.sc., environ. | Western horned tragopan | Tragopan melanocephalus |
| zool. | Western tragopan | Tragopan melanocephalus |
| ichtyol. | Western Transcaucasian Lamprey | Lethenteron ninae |
| entomol. | western tree-hole mosquito | Aedes sierrensis |
| nat.sc., agric. | Western trumpeter sillago | Sillago burrus |
| entomol. | Western turnip beetle | Entomoscelis americana |
| entomol. | western tussock moth | Orgyia vetusta |
| ornit. | western violet-backed sunbird | Anthreptes longuemarei |
| zool. | Western violet-backed sunbird | Anthreptes longuemarei |
| zool. | Western voles | Alticola |
| biol. | western wahoo | Euonymus occidentalis Nott. |
| zool. | Western warbling-vireo | Vireo swainsonii |
| reptil. | western water python | Bothrochilus perthensis |
| entomol. | western wheat aphid | Brachycolus frequens |
| entomol. | western wheat aphid | Brachycolus korotnevi |
| nat.res. | western wheat aphid | Diuraphis tritici |
| biol. | western wheat aphid | Brachycolus tritici Gillette |
| biol. | western wheat grass | Agropyron smithii Rydb. |
| entomol. | western wheat-stem sawfly | Cephus orientalis |
| reptil. | western whip snake | Coluber viridiflavus |
| ornit. | western whipbird | Psophodes nigrogularis |
| zool. | Western whipbird | Psophodes nigrogularis |
| reptil. | western whiptail | Cnemidophorus Thrasops |
| bot. | Western white pine | Pinus monticola |
| ichtyol. | western white shrimp | Penaeus occidentalis |
| ichtyol. | western wing oyster | Pteria sterna |
| entomol. | western winter moth | Erannis vancouverensis |
| biol. | western winter-green | Gaultheria humifusa Graham Rydb. |
| entomol. | western wintermoth | Erannis vancouverensis |
| nat.res. | western wireworm | Agriotes sparsus |
| entomol. | western w-marked borer | Spaelotis havilae |
| nat.res. | Western wobbegong | Orectolobus sp. A |
| ornit. | western wood pewee | Contopus sordidulus |
| zool. | Western wood-pewee | Contopus sordidulus |
| zool. | Western wren-warbler | Calamonastes simplex cinereus |
| nat.sc., forestr. | western yellow pine | Pinus benthami Mill. |
| nat.sc., forestr. | western yellow pine | Pinus parrayana Gord. |
| nat.sc., forestr. | western yellow pine | Pinus ponderosa |
| ornit. | western yellow robin | Eopsaltria griseogularis |
| biol. | western yellow striped armyworm | Prodenia praefica (Grote.) |
| entomol. | western yellow-striped borer | Spodoptera praefica |
