Eight reptiles that occur on North Padre Island a Plestiodon obsoletus (great plains skink b Scincella lateralis (little brown skink) c Aspidoscelis sexlineatus (six-lined racerunner) d Coluber constrictor (North American racer) e Heterodon platirhinos (eastern hognose snake) f Lampropeltis triangulum annulata (Tamaulipan milksnake) g Masticophis flagellum (coachwhip) h Nerodia rhombifer (diamondback watersnake).