lol, in texas the list is BIG, so i am just going to do genus,
(if u have a problem with my spelling u can suck on an sistrus!)
Leptotyphlopidae (Blind Snakes)
Leptotyphlops (Blind Snakes)
o Leptotyphlops dulcis (Texas Blind Snake)
o Leptotyphlops humilis (Trans-Pecos Blind Snake)
Colubridae
Arizona (Glossy Snakes)
o Arizona elegans (Eastern Glossy Snake)
Bogertophis
o Bogertophis subocularis (Trans-Pecos Rat Snake)
Carphophis (Worm Snakes)
o Carphophis vermis (Western Worm Snake)
Cemophora (Scarlet Snakes)
o Cemophora coccinea (Scarlet Snake)
Coluber (Racers)
o Coluber constrictor (Eastern Racer)
Coniophanes
o Coniophanes imperialis (Black-striped Snake)
Diadophis (Ringneck Snakes)
o Diadophis punctatus (Ringneck Snake)
Drymarchon (Indigo Snakes)
o Drymarchon corais (Texas Indigo Snake)
Drymobius
o Drymobius margaritiferus (Speckled Racer)
Elaphe (Rat Snakes)
o Elaphe bairdi (Baird's Rat Snake)
o Elaphe emoryi (Great Plains Rat Snake)
o Elaphe guttata (Corn Snake)
o Elaphe obsoleta (Eastern Rat Snake)
Farancia (Mud and Rainbw Snakes)
o Farancia abacura (Mud Snake)
Ficimia
o Ficimia streckeri (Mexican Hooknose Snake)
Gyalopion
o Gyalopion canum (Western Hooknose Snake)
Heterodon (Hognose Snakes)
o Heterodon nasicus (Western Hognose Snake)
o Heterodon platirhinos (Eastern Hognose Snake)
Hypsiglena (Night Snakes)
o Hypsiglena torquata (Night Snake)
Lampropeltis (Kingsnakes and Milk Snakes)
o Lampropeltis alterna (Gray-banded Kingsnake)
o Lampropeltis calligaster (Prairie Kingsnake)
o Lampropeltis getula (Common Kingsnake)
o Lampropeltis triangulum (Milk Snake)
Leptoderia
o Leptoderia septentrionalis (Northern Cat-eyed Snake)
Liochlorophis
o Liochlorophis vernalis (Smooth Green Snake)
Masticophis (Coachwhip Snakes and Whipsnakes)
o Masticophis flagellum (Coachwhip Snake)
o Masticophis schotti (Schott's Whipsnake)
o Masticophis taeniatus (Striped Whipsnake)
Nerodia (Water Snakes)
o Nerodia clarkii (Gulf Salt Marsh Snake)
o Nerodia cyclopion (Mississippi Green Water Snake)
o Nerodia erythrogaster (Plainbelly Water Snake)
o Nerodia fasciata (Southern Water Snake)
o Nerodia harteri (Brazos Water Snake)
o Nerodia paucimaculata (Concho Water Snake)
o Nerodia rhombifer (Diamondback Water Snake)
Opheodrys (Green Snakes)
o Opheodrys aestivus (Rough Green Snake)
Pituophis
o Pituophis catenifer (Gopher Snake)
o Pituophis ruthveni (Louisiana Pine Snake)
Regina (Crayfish Snakes)
o Regina grahamii (Graham's Crayfish Snake)
o Regina rigida (Gulf Crayfish Snake)
Rhinocheilus (Longnose Snakes)
o Rhinocheilus lecontei (Longnose Snake)
Salvadora (Patchnose Snakes)
o Salvadora deserticola (Big Bend Patchnose Snake)
o Salvadora grahamiae (Mountain Patchnose Snake)
Sonora (Ground Snakes)
o Sonora semiannulata (Ground Snake)
Storeria
o Storeria dekayi (Brown Snake)
o Storeria occipitomaculata (Redbelly Snake)
Tantilla
o Tantilla atriceps (Mexican Blackhead Snake)
o Tantilla cucullata (Big Bend Blackhead Snake)
o Tantilla gracilis (Flathead Snake)
o Tantilla hobartsmithi (Southwestern Blackhead Snake)
o Tantilla nigriceps (Plains Blackhead Snake)
Thamnophis (Garter and Ribbon Snakes)
o Thamnophis cyrtopsis (Blackneck Garter Snake)
o Thamnophis marcianus (Checkered Garter Snake)
o Thamnophis proximus (Western Ribbon Snake)
o Thamnophis radix (Plains Garter Snake)
o Thamnophis sirtalis (Common Garter Snake)
Trimorphodon
o Trimorphodon biscutatus (Lyre Snake)
Tropidoclonion
o Tropidoclonion lineatum (Lined Snake)
Virginia (Earth Snakes)
o Virginia striatula (Rough Earth Snake)
o Virginia valeriae (Western Earth Snake)
Elapidae
Micrurus (Coral Snakes)
o Micrurus tener (Texas Coral Snake)
Viperidae
Agkistrodon
o Agkistrodon contortrix (Copperhead)
o Agkistrodon piscivorus (Cottonmouth)
Crotalus
o Crotalus atrox (Western Diamondback Rattlesnake)
o Crotalus horridus (Timber Rattlesnake)
o Crotalus lepidus (Rock Rattlesnake)
o Crotalus molossus (Blacktail Rattlesnake)
o Crotalus scutulatus (Mojave Rattlesnake)
o Crotalus viridis (Prairie Rattlesnake)
Sistrurus
o Sistrurus catenatus (Massasauga)
o Sistrurus miliarius (Pigmy Rattlesnake)
well i think thats about it