Colubridae (Harmless Egg-laying Snakes)
Trans-Pecos Ratsnake (Bogertophis subocularis)  
Scarlet Snake (Cemophora coccinea)
Racer (Coluber constrictor)  photos added 8/16/11
Indigo Snake (Drymarchon melanurus)
Speckled Racer (Drymobius margaritiferus)
Gray-banded Kingsnake (Lampropeltis alterna)  
Mole Kingsnake (Lampropeltis calligaster)
Common Kingsnake (Lampropeltis getula)  
Durango Mountain Kingsnake (Lampropeltis [mexicana] greeri)  
Variable Kingsnake (Lampropeltis [mexicana] leonis)  
Sonoran Mountain Kingsnake (Lampropeltis pyromelana)
Milksnake (Lampropeltis triangulum)
Coachwhip (Masticophis flagellum)  
Schott's Whipsnake (Masticophis schotti)
Striped Whipsnake (Masticophis taeniatus)
Rough Green Snake (Opheodrys aestivus)  
Cornsnake (Pantherophis guttatus)  
Ratsnake (Pantherophis obsoletus)
Gopher/Bullsnake (Pituophis catenifer)
Longnose Snake (Rhinocheilus lecontei) NEW! photos added 8/16/11
Big Bend Patchnose Snake (Salvadora deserticola)  
Graham's Patchnose Snake (Salvadora grahamiae)
Green Ratsnake (Senticolis triaspis)
Flatheaded Snake (Tantilla gracilis)
Southwestern Blackheaded Snake (Tantilla hobartsmithi)



Natricidae (Harmless Live-bearing Snakes)
Saltmarsh Snake (Nerodia clarki)
Plain-bellied Watersnake (Nerodia erythrogaster)  
Banded Watersnake (Nerodia fasciata)  
Northern Watersnake (Nerodia sipedon)
Diamondbacked Watersnake (Nerodia rhombifer)  
Glossy Crayfish Snake (Regina rigida)
Black Swamp Snake (Seminatrix pygea)
Black-necked Gartersnake (Thamnophis cyrtopsis)
Western Terrestrial Gartersnake (Thamnophis elegans) photos added 8/16/11
Checkered Gartersnake (Thamnophis marcianus)
Northwestern Gartersnake (Thamnophis ordinoides) NEW! photos added 8/16/11
Western Ribbon Snake (Thamnophis proximus) 
Plains Gartersnake (Thamnophis radix)
Narrow-headed Gartersnake (Thamnophis rufipunctatus)
Common Gartersnake (Thamnophis sirtalis)  photos added 8/16/11



Lamprophiidae (Old World Snakes)
Cape Wolf Snake (Lycophidion capense)  



Psammophidae (African Rear-fanged Snakes)
Striped Skaapsteker (Psammophylax tritaeniatus)  



Dipsadidae (Slender Rear-fanged Snakes)
Eastern Worm Snake (Carphophis amoenus)
Ring-necked Snake (Diadophis punctatus)



Xenodontidae (Robust Rear-fanged Snakes)
Western Hognose Snake (Heterodon nasicus)
Eastern Hognose Snake (Heterodon platyrhinos)