﻿3. IGUANID& 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 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'. — 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. 



Phrynosoma. — p. 364. 



