Harlequin Coralsnake (Micrurus fulvius)
Texas Coralsnake (Micrurus tener)
Kirtland's Snake (Clonophis kirtlandii)
Gulf Saltmarsh Snake (Nerodia clarkii clarkii)
Mangrove Saltmarsh Snake (Nerodia clarkii compressicauda)
Atlantic Saltmarsh Snake (Nerodia clarkii taeniata)
Banded Watersnake (Nerodia fasciata)
Florida Green Watersnake (Nerodia floridana)
Brazos Watersnake (Nerodia harteri)
Diamond-backed Watersnake (Nerodia rhombifer)
Common Watersnake (Nerodia sipedon)
Brown Watersnake (Nerodia taxispilota)
Concho Watersnake (Nerodia paucimaculata)
Dekay's Brownsnake (Storeria dekayi)
Red-bellied Snake (Storeria occipitomaculata)
Short-headed Gartersnake (Thamnophis brachystoma)
Butler's Gartersnake (Thamnophis butleri)
Two-striped Gartersnake (Thamnophis hammondi)
Eastern Ribbonsnake (Thamnophis saurita)
Blue-striped Gartersnake (Thamnophis sirtalis similis)
Eastern Gartersnake (Thamnophis sirtalis sirtalis)
Checkered gartersnake (Thamnophis marcianus)
Western Ribbonsnake (Thamnophis proximus)
Plains Gartersnake (Thamnophis radix)
Common Glossy Snake (Arizona elegans)
Trans-Pecos Ratsnake (Bogertophis subocularis)
Speckled Racer (Drymobius margaritiferus)
North American Racer (Coluber constrictor)
Brown-chinned Racer (Coluber constrictor helvigularis)
Lined Snake (Tropidoclonion lineatum)
Rough Earth Snake (Haldea striatula)
Queensnake (Regina septemvittata)
Graham's Crayfish Snake (Regina grahamii)
Glossy Swampsnake (Liodytes rigida)
Striped Swampsnake (Liodytes alleni)
Black Swampsnake (Liodytes pygaea)
Eastern Smooth Earthsnake (Virginia valeriae valeriae)
Mountain Earthsnake (Virginia valeriae pulchra)
Common Wormsnake (Carphophis amoenus)
Common Scarletsnake (Cemophora coccinea)
Key Ring-necked Snake (Diadophis punctatus acricus)
Southern Ring-necked Snake (Diadophis punctatus punctatus)
Regal Black-striped Snake (Coniophanes imperialis)
Rainbow Snake (Farancia erytrogramma)
Mud Snake (Farancia abacura)
Tamaulipan Hook-nosed Snake (Ficimia streckeri)
Western Hog-nosed Snake (Heterodon nasicus)
Southern Hog-nosed Snake (Heterodon simus)
Eastern Hog-nosed Snake (Heterodon platirhinos)
Desert Nightsnake (Hypsiglena chlorophaea)
Chihuahuan Nightsnake (Hypsiglena jani)
San Diego Nightsnake (Hypsiglena ochrorhyncha klauberi)
Northern Cat-eyed Snake (Leptodeira septemvittata)
California Striped Racer (Masticophis lateralis lateralis)
Coachwhip (Masticophis flagellum)
Schott's Whipsnake (Masticophis schotti)
Rough Greensnake (Opheodrys aestivus)
Smooth Greensnake (Opheodrys vernalis)
Central Ratsnake (Pantherophis alleghaniensis)
Baird's Ratsnake (Pantherophis bairdi)
Great Plains Ratsnake (Pantherophis emoryi)
Red Cornsnake (Pantherophis guttatus)
Western Foxsnake (Pantherophis ramspotti)
Yellow Ratsnake (Pantherophis quadrivittatus)
Eastern Fox Snake (Pantherophis vulpinus)
Pacific Gophersnake (Pituophis catenifer catenifer)
Sonora Gophersnake (Pituophis catenifer affinis)
Eastern Pinesnake (Pituophis melanoleucus)
Central American Indigo Snake (Drymarchon melanurus)
Eastern Indigo Snake (Drymarchon couperi)
Mexican Milksnake (Lampropeltis annulata)
Prairie Kingsnake (Lampropeltis calligaster)
Scarlet Kingsnake (Lampropeltis elapsoides)
Short-tailed Kingsnake (Lampropeltis extenuata)
"Black" Kingsnake (Lampropeltis getula)
"Eastern" Kingsnake (Lampropeltis getula)
"Florida" Kingsnake (Lampropeltis getula)
Eastern Milksnake (Lampropeltis triangulum)
"San Bernardino" Mountain Kingsnake (Lampropeltis zonata)
"San Diego" Mountain Kingsnake (Lampropeltis zonata)
Texas Patch-nosed Snake (Salvadora lineata)
Western Groundsnake (Sonora semiannulata)
Great Plains Groundsnake (Sonora episcopa)
Central Florida Crowned Snake (Tantilla relicta neilli)
Coastal Dunes Crowned Snake (Tantilla relicta pamlica)
Peninsula Crowned Snake (Tantilla relicta relicta)
Flat-headed Snake (Tantilla gracilis)
Trans-Pecos Black-headed Snake (Tantilla cucullata)
Long-nosed Snake (Rhinocheilus lecontei)
Northern Cottonmouth (Agkistrodon piscivorous)
Eastern Copperhead (Agkistrodon contortrix)
Broad-banded Copperhead (Agkistrodon laticinctus)
Eastern Diamond-backed Rattlesnake (Crotalus adamanteus)
Western Diamond-backed Rattlesnake (Crotalus atrox)
Timber Rattlesnake (Crotalus horridus)
Sidewinder (Crotalus cerastes)
Southern Pacific Rattlesnake (Crotalus helleri)
Rock Rattlesnake (Crotalus lepidus)
Western Black-tailed Rattlesnake (Crotalus molossus)
Twin-spotted Rattlesnake (Crotalus pricei)
Red Diamond Rattlesnake (Crotalus ruber)
Mohave Rattlesnake (Crotalus scutulatus)
Tiger Rattlesnake (Crotalus tigris)
Prairie Rattlesnake (Crotalus viridis)
Ridge-nosed Rattlesnake (Crotalus willardi)
Dusky Pygmy Rattlesnake (Sistrurus miliarius barbouri)
Carolina Pygmy Rattlesnake (Sistrurus miliarius miliarius)
Eastern Massasauga (Sistrurus catenatus)