3. IGUANID& 63 



g 8 . No ear-opening. 



Holbrookia. p. 169. 



e\ Supralabials not imbricate; symphyseal plate 



not smaller than largest inf ralabial. 

 ff. No large interparietal plate; caudal scales 

 small, not strongly keeled not sharply pointed. 

 Ear without strong denticulation and neck 

 without spinose tubercles ; superciliaries im- 

 bricate; tail long and tapering. 



Crotaphytus. p. 104. 



fF. A very large interparietal plate; caudal scales 

 often large, strongly keeled, and sharply 

 pointed. 



gg. Body and tail more or less depressed, no 

 vertebral ridge; gular fold well-developed, 

 fixed, with differentiated scales; males with 

 postanal plates. 



Uta. p. 180. 



gg a . Body and tail compressed, a slight verte- 

 bral ridge; gular fold sometimes indefinite, 

 with scales little or not differentiated; 

 males without enlarged postanals. 

 Sator. p. 254. 



c*. No complete transverse gular fold; no lateral fold 

 between limbs. 



Sceloporus. p. 261. 



bb*. Head with spines pqgteriorly. 



Phrynosoma. p. 364. 



