Eumeces Obsoletus  SKINKS  No lines on body

Eumeces Tetragammus  SKINKS  Light stripe above eye

Scincella Lateralis  SKINKS  No light stripe

Cnemidophorus Sexlineatus  STRIPED WHIPTAILS  No spots and granular scales on back forelimbs

Cnemidophorus Laredoensis  STRIPED WHIPTAILS  Moderately enlarged forelimb scales & white, tan, or green tail

Cnemidophorus Gularis  STRIPED WHIPTAILS  Extremely enlarged forelimb scales & reddish/pinkish tail

Anolis Carolinensis  ANOLES  Primarily green  Elongated snout in line that taper evenly with rest of skull

Anolis Sagrei  ANOLES  Brown anoles

Hemidactylus Turcicus  GECKOS  Bumpy skin, no eyelids

Coleonyx Brevis  GECKOS  Striped skin, eyelids

Crotaphytus Reticulatus  SMOOTH SKINNED LIZARDS  External ear openings & dark spots on back

Cophosaurus Texanus  SMOOTH SKINNED LIZARDS  Black bars on ventral side of tail

Holbrookia Propinqua  SMOOTH SKINNED LIZARDS  Tail length longer than body length, no ventral spots on tail

Holbrookia Lacerta  SMOOTH SKINNED LIZARDS  Tail with ventral spots

Ctenosaura Pectinata  SPINY LIZARDS  Low crest of scales down the back (in Brownsville)

Phrynosoma Cornutum  SPINY LIZARDS  Large spines on head

Urosaurus Ornatus  SPINY LIZARDS  A fold across throat

Sceloporus Serrifer  SPINY LIZARDS  Distinct collar

Sceloporus Variabilis  SPINY LIZARDS  Pocket behind hindlimbs

Sceloporus Grammicus  SPINY LIZARDS  Wavy lines on back, no stripe on side

Sceloporus Undulatus  SPINY LIZARDS  Clearly defined light stripe on side

Sceloporus Olivaceus  SPINY LIZARDS  Light stripe not clearly defined

Ophisaurus Attenuatus  LEGLESS LIZARDS  Moveable eyelids