Family Leptotyphlopidae
Plains Blind Snake
(Leptotyphlops dulcis dulcis)
Family Colubridae
Queen Snake
(Regina septemvittata)
Mississippi Green Water Snake
(Nerodia cyclopion)
Florida Green Water Snake
(Nerodia cyclopion floridana)
Brown Water Snake
(Nerodia taxispilota)
Diamondback Water Snake
(Nerodia rhombifer rhombifer)
Redbelly Water Snake
(Nerodia erythrogaster flavigaster)
Yellowbelly Water Snake
(Nerodia erythrogaster flavigaster)
Copperbelly Water Snake
(Nerodia erythogaster neglecta)
Blotched Water Snake
(Nerodia erythrogaster transversa)
Northern Water Snake
(Nerodia sipedon sipedon)
Midland Water Snake
(Nerodia sipedon pleuralis)
Banded Water Snake
(Nerodia fasciatus fasciatus)
Broadbanded Water Snake
(Nerodia fasciatus confluens)
Eastern Mud Snake
(Farancia abacura abacura)
Western Mud Snake
(Farancia abacura reinwardtii)
Rainbow Snake
(Farancia erytrogramma)
Texas Brown Snake
(Storeria dekayi texana)
Midland Brown Snake
(Storeria dekayi wrightorum)
Redbelly Snake
(Storeria occipitomaculata occipitomaculata)
Eastern Garter Snake
(Thamnophis sirtalis sirtalis)
Redsided Garter Snake
(Thamnophis sirtalis parietalis)
Checkered Garter Snake
(Thamnophis marcianus marcianus)
Western Blackneck Garter Snake
(Thamnophis cyrtopsis cyrtopsis)
Eastern Plains Garter Snake
(Thamnophis radix radix)
Western Plains Garter Snake
(Thamnophis radix haydeni)
Eastern Ribbon Snake
(Thamnophis sauritus sauritus)
Northern Ribbon Snake
(Thamnophis sauritus septentrionalis)
Peninsula
Ribbon Snake
(Thamnophis sauritus sackenii)
Western Ribbon Snake
(Thamnophis proximus proximus)
Gulf Coast Ribbon Snake
(Thamnophis proximus orarius)
Lined Snake
(Tropidoclonion lineatum)
Ground Snake
(Sonora semiannulata)
Rough Earth Snake
(Virginia striatula)
Western Smooth Earth Snake
(Virginia valeriae elegans)
Eastern Hognose Snake
(Heterodon platirhinos)
Mexican Hognose Snake
(Heterodon kennerlyi)
Southern Ringneck Snake
(Diadophis punctatus punctatus)
Prairie Ringneck Snake
(Diadophis punctatus arnyi)
Mississippi Ringneck Snake
(Diadophis punctatus stictogenys)
Northern Ringneck Snake
(Diadophis punctatus edwardsi)
Western Worm Snake
(Carphophis vermis)
Eastern Worm Snake
(Carphophis amoenus amoenus)
Midwest Worm Snake
(Carphophis amoenus helenae)
Mountain Patchnosed Snake
(Salvadora grahamiae grahamiae)
Western Coachwhip
(Masticophis flagellum testaceus)
Northern Black Racer
(Coluber constrictor constrictor)
Southern Black Racer
(Coluber constrictor priapus)
Eastern Yellowbelly Racer
(Coluber constrictor flaviventris)
Blue Racer
(Coluber constrictor foxi)
Brownchin Racer
(Coluber constrictor helvigularis)
Speckled Racer
(Drymobius margaritiferus margaritiferus)
Rough Green Snake
(Opheodrys aestivus)
Black Rat Snake
(Elaphe [Pantherophis] obsoleta obsoleta)
Yellow Rat Snake
(Elaphe obsoleta quadrivittata)
Gray Rat Snake
(Elaphe obsoleta spiloides)
Baird's Rat Snake
(Elaphe bairdi)
Great Plains Rat Snake
(Elaphe emoryi)
Western Fox Snake
(Elaphe vulpina vulpina)
Trans Pecos Rat Snake
(Bogertophis subocularis)
Speckled Kingsnake
(Lampropeltis getula holbrooki)
Speckled - Black King Intergrade
(L. getula holbrooki X nigra)
Speckled - Desert King Intergrade
(L. getula holbrooki X splendida)
Prairie Kingsnake
(Lampropeltis calligaster calligaster)
Eastern Milk Snake
(Lampropeltis triangulum triangulum)
Red Milk Snake
(Lampropeltis triangulum syspila)
Central Plains Milk Snake
(Lampropeltis triangulum gentilis)
Scarlet
Kingsnake
(Lampropeltis triangulum elapsoides)
Bullsnake
(Pituophis catenifer sayi)
Sonoran Gopher Snake
(Pituophis catenifer affinis)
Florida Pine Snake
(Pituophis melanoleucus mugitus)
Western Longnose Snake
(Rhinocheilus lecontei lecontei)
Texas Longnose Snake
(Rhinocheilus lecontei tessellatus)
Flathead Snake
(Tantilla gracilis)
Southwestern Blackheaded Snake
(Tantilla hobartsmithi)
Spotted Night Snake
(Hypsiglena torquata torquata)
Texas Night Snake
(Hypsiglena torquata jani)
Family Viperidae;
Subfamily Crotalinae
Southern Copperhead
(Agkistrodon contortrix contortrix)
Northern Copperhead
(Agkistrodon contortrix mokasen)
Osage Copperhead
(Agkistrodon contortrix phaeogaster)
Eastern Cottonmouth
(Agkistrodon piscivorus piscivorus)
Western Cottonmouth
(Agkistrodon piscivorus leucostoma)
Florida Cottonmouth
(Agkistrodon piscivorus conanti)
Eastern Massasauga
(Sistrurus catenatus catenatus)
Western Massasauga
(Sistrurus catenatus tergeminus)
Dusky Pigmy
Rattlesnake
(Sistrurus miliarius barbouri)
Timber Rattlesnake
(Crotalus horridus)
Eastern Diamondback Rattlesnake
(Crotalus adamanteus)
Western Diamondback Rattlesnake
(Crotalus atrox)
Northern Blacktailed Rattlesnake
(Crotalus molossus molossus)
Arizona Ridgenosed Rattlesnake
(Crotalus willardi willardi)
Mojave Rattlesnake
(Crotalus scutellatus)
Sonoran Sidewinder
(Crotalus cerastes cercobombus)