1. Eumeces Obsoletus  SKINKS  No lines on body

2. Eumeces Tetragammus  SKINKS  Light stripe above eye

3. Scincella Lateralis  SKINKS  No light stripe

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

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

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

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

8. Anolis Sagrei  ANOLES  Brown anoles

9. Hemidactylus Turcicus  GECKOS  Bumpy skin, no eyelids

10. Coleonyx Brevis  GECKOS  Striped skin, eyelids

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

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

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

14. Holbrookia Lacerta  SMOOTH SKINNED LIZARDS  Tail with ventral spots

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

16. Phrynosoma Cornutum  SPINY LIZARDS  Large spines on head

17. Urosaurus Ornatus  SPINY LIZARDS  A fold across throat

18. Sceloporus Serrifer  SPINY LIZARDS  Distinct collar

19. Sceloporus Variabilis  SPINY LIZARDS  Pocket behind hindlimbs

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

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

22. Sceloporus Olivaceus  SPINY LIZARDS  Light stripe not clearly defined

23. Ophisaurus Attenuatus  LEGLESS LIZARDS  Moveable eyelids