Opinions from C. B. Schultz and E. B. Howard 1935
- 'Accipiter belongs to Accipitridae'
- 'Aechmophorus belongs to Colymbidae'
- 'Antilocapra belongs to Antilocapridae'
- 'Antilope americana is recombined as Antilocapra americana'
- 'Arctodus belongs to Ursidae'
- 'Arctomys flaviventer is recombined as Marmota flaviventris'
- 'Arctomys ludoviciana is recombined as Cynomys ludovicianus'
- 'Arctotherium is a subjective synonym of Arctodus'
- 'Ardea canadensis is recombined as Grus canadensis'
- 'Arvicola mexicana is recombined as Microtus mexicanus'
- 'Arvicola mordax is recombined as Microtus mordax'
- 'Asio belongs to Strigidae'
- 'Bassaris astutus is recombined as Bassariscus astutus'
- 'Bassariscus belongs to Bassariscidae'
- 'Bison belongs to Bovidae'
- 'Bison antiquus belongs to Bison'
- 'Bison taylori is recombined as Bison antiquus taylori'
- 'Bubo belongs to Strigidae'
- 'Buteo belongs to Accipitridae'
- 'Buteo swainsoni belongs to Buteo' according to Bonaparte 1838
- 'Buteo swainsoni belongs to Buteo'
- 'Camelops belongs to Camelidae'
- 'Canis belongs to Canidae'
- 'Canis latrans belongs to Canis'
- 'Canis microdon belongs to Canis'
- 'Canis nubilus belongs to Canis'
- 'Canis velox is recombined as Vulpes velox'
- 'Cathartes belongs to Cathartidae'
- 'Cervus hemionus is recombined as Odocoileus hemionus'
- 'Colaptes belongs to Picidae'
- 'Conepatus belongs to Mustelidae'
- 'Coragyps belongs to Cathartidae'
- 'Cratogeomys belongs to Geomyidae'
- 'Cupidonia cupido pallidicincta belongs to Cupidonia cupido' according to Ridgway 1873
- 'Cupidonia cupido pallidicincta is recombined as Tympanuchus pallidicinctus'
- 'Cynomys belongs to Sciuridae'
- 'Dama virginiana is recombined as Odocoileus virginianus'
- 'Dipodomys montanus belongs to Dipodomys' according to Baird 1855
- 'Dipodomys montanus is recombined as Perodipus montanus'
- 'Equus belongs to Equidae'
- 'Equus excelsus belongs to Equus'
- 'Equus tau belongs to Equus'
- 'Euceratherium belongs to Bovidae'
- 'Euceratherium collinum belongs to Euceratherium'
- 'Euceratherium collinum morrisi belongs to Euceratherium collinum'
- 'Falco belongs to Falconidae'
- 'Falco cooperi belongs to Falco' according to Bonaparte 1828
- 'Falco cooperi is recombined as Accipiter cooperi'
- 'Falco mexicanus belongs to Falco'
- 'Falco mexicanus belongs to Falco' according to Schlegel 1850
- 'Falco sparverius belongs to Falco'
- 'Felis belongs to Felidae'
- 'Felis hippolestes is recombined as Felis concolor hippolestes'
- 'Felis rufa is recombined as Lynx rufus'
- 'Geomys fulvus belongs to Geomys' according to Woodhouse 1852
- 'Geomys fulvus is recombined as Thomomys fulvus'
- 'Grus belongs to Gruidae'
- 'Gymnogyps belongs to Cathartidae'
- 'Hesperomys maniculatus is recombined as Peromyscus maniculatus'
- 'Homo belongs to Hominidae'
- 'Homo sapiens belongs to Homo'
- 'Icterus xanthocephalus belongs to Icterus' according to Bonaparte 1826
- 'Icterus xanthocephalus is recombined as Xanthocephalus xanthocephalus'
- 'Lepus belongs to Leporidae'
- 'Lepus alleni belongs to Lepus'
- 'Lepus audubonii is recombined as Sylvilagus auduboni'
- 'Lepus sylvaticus floridanus is recombined as Sylvilagus floridanus'
- 'Lepus townsendii belongs to Lepus'
- 'Loxia belongs to Fringillidae'
- 'Loxia curvirostra belongs to Loxia'
- 'Marmota belongs to Sciuridae'
- 'Meleagris belongs to Meleagridae'
- 'Meleagris gallopavo belongs to Meleagris'
- 'Mephitis mesoleucus is recombined as Conepatus mesoleucus'
- 'Microtus belongs to Muridae'
- 'Mus cinereus is recombined as Neotoma cinerea'
- 'Mustela belongs to Mustelidae'
- 'Neotoma belongs to Muridae'
- 'Neotoma lepida belongs to Neotoma'
- 'Neotoma mexicana belongs to Neotoma'
- 'Odocoileus belongs to Cervidae'
- 'Oreortyx belongs to Perdicidae'
- 'Ortyx picta belongs to Ortyx' according to Douglas 1829
- 'Ortyx picta is recombined as Oreortyx picta'
- 'Otospermophilus belongs to Sciuridae'
- 'Ovis belongs to Bovidae'
- 'Ovis canadensis auduboni belongs to Ovis canadensis' according to C. H. Merriam 1901
- 'Ovis canadensis auduboni is recombined as Ovis auduboni'
- 'Pappogeomys belongs to Geomyidae'
- 'Perodipus belongs to Heteromyidae'
- 'Peromyscus belongs to Muridae'
- 'Podiceps occidentalis is recombined as Aechmophorus occidentalis'
- 'Podiceps occidentalis belongs to Podiceps' according to Lawrence 1858
- 'Preptoceras belongs to Bovidae'
- 'Preptoceras sinclairi belongs to Preptoceras'
- 'Preptoceras sinclairi neomexicana belongs to Preptoceras sinclairi'
- 'Pseudostoma castanops is recombined as Cratogeomys castanops'
- 'Putorius nigripes is recombined as Mustela nigripes'
- 'Rangifer belongs to Cervidae'
- 'Rangifer fricki belongs to Rangifer'
- 'Sangamona belongs to Cervidae'
- 'Sciurus grammurus is recombined as Otospermophilus grammurus'
- 'Strix flammea belongs to Strix' according to Pontoppidan 1763
- 'Strix flammea is recombined as Asio flammeus'
- 'Strix virginiana belongs to Strix' according to Gmelin 1788
- 'Strix virginiana is recombined as Bubo virginianus'
- 'Sylvilagus belongs to Leporidae'
- 'Taxidea belongs to Mustelidae'
- 'Tetrameryx belongs to Antilocapridae'
- 'Tetrameryx onusrosagris belongs to Tetrameryx'
- 'Tetrao cupido is recombined as Cupidonia cupido' according to Reichenbach 1852
- 'Thomomys belongs to Geomyidae'
- 'Tympanuchus belongs to Tetraonidae'
- 'Ursus taxus is recombined as Taxidea taxus'
- 'Vulpes belongs to Canidae'
- 'Vulpes macroura belongs to Vulpes' according to Baird 1852
- 'Vulpes macroura belongs to Vulpes'
- 'Vultur atratus belongs to Vultur' according to Bechstein 1793
- 'Vultur atratus is recombined as Coragyps atratus'
- 'Vultur aura is recombined as Cathartes aura'
- 'Vultur californianus is recombined as Gymnogyps californianus'
- 'Xanthocephalus belongs to Icteridae'