Thamnophis angustirostris (Kennicott, 1860)
Thamnophis atratus
Thamnophis atratus atratus (Kennicott, 1860)
Thamnophis atratus hydrophilus (Fitch, 1936)
Thamnophis atratus zaxanthus (Boundy, 1999)
Thamnophis bogerti (Rossman & Burbrink 2005)
Thamnophis brachystoma (Cope, 1892)
Thamnophis butleri (Cope, 1889)
Thamnophis chrysocephalus (Cope, 1885)
Thamnophis conanti (Rossman & Burbrink 2005)
Thamnophis couchii (Kennicott, 1859)
Thamnophis cyrtopsis
Thamnophis cyrtopsis cyrtopsis (Kennicott, 1860)
Thamnophis cyrtopsis ocellatus (Cope, 1880)
Thamnophis cyrtopsis collaris (Jan, 1863)
Thamnophis cyrtopsis postremus (Smith, 1942)
Thamnophis cyrtopsis pulchrilatus (Cope, 1885)
Thamnophis elegans
Thamnophis elegans arizonae (Tanner & Lowe, 1989)
Thamnophis elegans elegans (Baird & Girard, 1853)
Thamnophis elegans errans (Smith, 1942)
Thamnophis elegans terrestris (Fox, 1951)
Thamnophis elegans vagrans (Baird & Girard, 1853)
Thamnophis elegans vascotanneri (Tanner & Lowe, 1989)
Thamnophis elegans hueyi (Van Denburgh & Slevin, 1923)
Thamnophis eques
Thamnophis eques eques (Reuss, 1834)
Thamnophis eques carmenensis (Conant, 2003)
Thamnophis eques cuitzeoensis (Conant, 2003)
Thamnophis eques diluvialis (Conant, 2003)
Thamnophis eques insperatus (Conant, 2003)
Thamnophis eques megalops (Kennicott, 1860)
Thamnophis eques obscurus (Conant, 2003)
Thamnophis eques patzcuaroensis (Conant, 2003)
Thamnophis eques scotti (Conant, 2003)
Thamnophis eques virgatenuis (Conant, 1963)
Thamnophis exsul (Rossman, 1969)
Thamnophis fulvus (Bocourt, 1893)
Thamnophis gigas (Fitch, 1940)
Thamnophis godmani (Günther, 1894)
Thamnophis hammondii (Kennicott, 1860)
Thamnophis lineri (Rossman & Burbrink 2005)
Thamnophis marcianus (Baird & Girard, 1853)
Thamnophis melanogaster
Thamnophis melanogaster canescens (Smith, 1942)
Thamnophis melanogaster chihuahuanensis (Tanner, 1959)
Thamnophis melanogaster linearis (Smith, Nixon & Smith, 1950)
Thamnophis melanogaster melanogaster (Peters, 1864)
Thamnophis mendax (Walker, 1955)
Thamnophis ordinoides (Baird & Girard, 1852)
Thamnophis proximus
Thamnophis proximus alpinus (Rossman, 1963)
Thamnophis proximus diabolicus (Rossman, 1963)
Thamnophis proximus orarius (Rossman, 1963)
Thamnophis proximus proximus (Say, 1823)
Thamnophis proximus rubrilineatus (Rossman, 1963)
Thamnophis proximus rutiloris (Cope, 1885)
Thamnophis radix (Baird & Girard, 1853)
Thamnophis rossmani (Conant, 2000)
Thamnophis rufipunctatus
Thamnophis rufipunctatus nigronuchalis (Thompson, 1957)
Thamnophis rufipunctatus unilabialis (Tanner, 1985)
Thamnophis rufipunctatus rufipunctatus (Cope, 1875)
Thamnophis sauritus
Thamnophis sauritus nitae (Rossman, 1963)
Thamnophis sauritus sackenii (Kennicott, 1859)
Thamnophis sauritus sauritus (Linnaeus, 1766)
Thamnophis sauritus septentrionalis (Rossman, 1963)
Thamnophis scalaris (Cope, 1861)
Thamnophis scaliger (Jan, 1863)
Thamnophis sirtalis
Thamnophis sirtalis annectens (Brown, 1950)
Thamnophis sirtalis concinnus (Hallowell, 1852)
Thamnophis sirtalis dorsalis (Baird & Girard, 1853)
Thamnophis sirtalis fitchi (Fox, 1951)
Thamnophis sirtalis infernalis (Blainville, 1835)
Thamnophis sirtalis lowei (Tanner, 1988)
Thamnophis sirtalis pallidula (Allen, 1899)
Thamnophis sirtalis parietalis (Say, 1823)
Thamnophis sirtalis pickeringii (Baird & Girard, 1853)
Thamnophis sirtalis similis (Rossman, 1965)
Thamnophis sirtalis sirtalis (Linnaeus, 1758)
Thamnophis sirtalis semifasciatus (Cope, 1892)
Thamnophis sirtalis tetrataenia (Cope, 1875)
Thamnophis sumichrasti (Cope, 1866)
Thamnophis valida
Thamnophis valida celaeno (Cope, 1860)
Thamnophis valida isabellae (Conant, 1953)
Thamnophis valida thamnophisoides (Conant, 1961)
Thamnophis valida valida (Kennicott, 1860)