Lower Rio Grande Valley National Wildlife Refuge -- Reptiles ALLIGATORIDAE American Alligator Alligator mississippiensis EMYDIDAE Red-eared Slider Chrysemys scripta elegans TRIONYCHIDAE Texas Spiny Softshell Apalone spinifera emoryi TESTUDINIDAE Texas Tortoise Gopherus berlandieri KINOSTERNIDAE Yellow Mud Turtle Kinosternon flavescens POLYCHROTIDAE Green Anole Anolis carolinensis Brown Anole Anolis sagrei TEIIDAE Texas Spotted Whiptail Cnemidophorus gularis gularis Laredo Striped Whiptail Cnemidophorus laredoensis Prairie Racerunner Cnemidophorus sexlineatus viridis GEKKONIDAE Texas Banded Gecko Coleonyx brevis PHRYNOSOMATIDAE Texas Earless Lizard Cophosaurus texanus texanus Keeled Earless Lizard Holbrookia popinqua Texas Horned Lizard Phrynosoma cornutum Mesquite Lizard Sceloporus grammicus Texas Spiny Lizard Sceloporus olivaceus Blue Spiny Sceloporus cyanogenys Southern Prairie Lizard Sceloporus undulatus consobrinus Rosebelly Lizard Sceloporus variabilis marmoratus CROTAPHYTIDAE Reticulate Collared Lizard Crotaphytus reticulatus SCINCIDAE Great Plains Skink Eumeces obsoletus Four-lined Skink Eumeces tetragrammus Ground Skink Scincella lateralis EUBLEPHARIDAE Mediterranean Gecko Hemidactylus turcicus LEPTOTYPHLOPIDAE Plains Blind Snake Leptotyphlops dulcis dulcis COLUBRIDAE Texas Glossy Snake Arizona elegans arenicola Mexican Racer Coluber constrictor Black-Striped Snake Coniophanes imperialis imperialis Texas Indigo Snake Drymarchon corais erebennus Speckled Racer Drymobius m. margaritiferus Great Plains Rat Snake Elaphe guttata emoryi Mexican Hooknose Snake Ficimia streckeri Mexican Hognose Snake Heterodon nasicus kennerlyi Texas Night Snake Hypsiglena torquata jani Desert Kingsnake Lampropeltis getulus splendida Desert Kingsnake Lampropeltis getula splendida Mexican Milk Snake Lampropeltis triangulum annulata Western Coachwhip Mastecophis flagellum testaceus Striped Whipsnake Masticophis taeniatus Diamondback Water Snake Nerodia rhombifer rhombifer Rough Green Snake Opheodrys aestivus Bullsnake Pituophis catenifer sayi Texas Longnose Snake Rhinocheilus lecontei tessellatus Texas Patchnose Snake Salvadora grahamiae lineata Texas Brown Snake Storeria dekayi texana Plains Blackhead Snake Tantilla nigriceps Checkered Garter Snake Thamnophis marcianus marcianus Western Ribbon Snake Thamnophis proximus ELAPIDAE Texas Coral Snake Micrurus fulvius tener VIPERIDAE Western diamondback rattlesnake Crotalus atrox .