3. IGUANIDJE 63 



g. — No ear-opening. 



Holbrookia. — p. 169. 

 e'. — Supralabials not imbricate; symphyseal plate 



not smaller than largest infralabial. 

 fF. — No large interparietal plate; caudal scales 

 small, not strongly Iceeled not sharply pointed. 

 Ear without strong denticulation and neck 

 without spinose tubercles; superciliaries im- 

 bricate; tail long and tapering. 



Crotaphytus. — p. 104. 

 flF'. — 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'. — 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 porteriorly. 



PhrynoEoma. — p. 364. 



