Classification of Behler and King 1979
Fm. Colubridae Oppel 1811 [colubrid snake]
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G. Arizona Kennicott 1859
G. Carphophis Gervais 1840 [worm snake]
G. Cemophora Cope 1860
G. Chilomeniscus Cope 1860
G. Chionactis Cope 1860
G. Clonophis Cope 1889
G. Coluber Linnaeus 1758 [racer]
G. Coniophanes Cope 1860
G. Contia Baird and Girard 1853
G. Diadophis Baird and Girard 1853 [ringneck snake]
G. Drymarchon Fitzinger 1843
G. Drymobius Fitzinger 1843
G. Elaphe Wagler 1833
G. Farancia Gray 1842
G. Ficimia Gray 1849
G. Gyalopion Cope 1860
G. Heterodon Latreille 1801 [hog-nosed snake]
G. Hypsiglena Cope 1860
G. Lampropeltis Fitzinger 1843
G. Leptodeira Fitzinger 1843
G. Masticophis Baird and Girard 1853 [whip snake]
G. Nerodia Baird and Girard 1853 [water snake]
G. Opheodrys Fitzinger 1843
G. Oxybelis Wagler 1830
G. Phyllorhynchus Stejneger 1890
G. Pituophis Holbrook 1842 [gopher snake]
G. Regina Baird and Girard 1853 [crayfish snake]
G. Rhadinaea Cope 1868
G. Rhinocheilus Baird and Girard 1853
G. Salvadora Baird and Girard 1853
G. Seminatrix Cope 1895
G. Sonora Baird and Girard 1853
G. Stilosoma Brown 1890 [short-tailed snake]
G. Storeria Baird and Girard 1853 [brown snake]
G. Tantilla Baird and Girard 1853
G. Thamnophis Fitzinger 1843 [garter snake]
G. Trimorphodon Cope 1869
G. Tropidoclonion Cope 1860
G. Virginia Baird and Girard 1853