37. Toes of hind feet flattened and swollen into pads; Family Iguanidae 



(part) 38. 



Toes not flattened or swollen 39. 



38. Tail narrowed and with a mid'dorsal keel; Key West, Florida 



Anolis stejnegeri Barbour Key Chameleon 

 Tail evenly cylindrical; southeastern states to Texas; introduced into 

 Kansas 



Anolis carolinensis Voigt American Chameleon, Fence Lizard 



39. Entire head and body covered with large, bead'like tubercles; toes of hind 



foot of about equal length; color yellowish to reddish, marbled with 

 dark; with poison glands in the lower jaw; Nevada, Utah and Ariz;.; 

 Family Helodermatidae 



Heloderma suspectum Cope Gila Monster 

 Body scaled or granulated; toes of hind foot quite unequal; no poison 

 glands 40. 



40. With a single row of enlarged, keeled or spiny scales along the middle 



of the back; Family Iguanidae (part) 41. 



Not so; sometimes with several lengthwise rows of enlarged scales 43. 



41. Back with large, pointed scales; no femoral pores; introduced into Florida 



Leiocephalus carinatus vhescens (Stejneger) Bahama Crested 



Lizard 



Back with small, flattened or keeled scales; males with femoral pores (a 



row of pores lengthwise along the rear of the inner side of the thigh) ; 



southwestern states 42. 



42. With a throat fold, covered by smaller scales; mid-dorsal row of scales 



flattened and keeled; tail rather smoothly scaled; Nevada, Colo., Ariz, 

 and Cal. 



Dipsosaurus dorsalis (B. &? G.) Desert Iguana 

 No throat fold; mid-dorsal row of scales in the form of upright spines; 

 tail spinose; Lower Cal. 



Ctenosaura hemilopha (Cope) Cape Iguana 



43. Scales hard, flat, glossy; no femoral pores; Family Scincidae Skinks or 



Smooth-scaled Lizards 44. 



Scales granular, or somewhat raised, dull; males with a row or rows of 



pores lengthwise along the rear of the inner side of the thigh (often 



very obscure and difficult to see) 62. 



44. No internasal plates, the interfrontonasal projecting between the two 



nasals; with a bare spot on the lower eyelid; with a dark stripe length- 

 wise along each side; 111. to Florida and Texas 



Leiolopisma unicolor (Harlan) Ground Lizard 

 (Leiolopisma laterale (Say) ) 

 With two internasal plates; lower eyelid entirely scaly; color various, 

 although often light striped 45. 



45. With 18-22 rows of scales around the middle of the body; tail reddish 46. 

 With 24 or more rows of scales around the middle of the body; tail color 



similar or not so 47. 



370 



