184 3. IGUANIDM 



bb'. — No longitudinal dorsolateral dermal fold; often a 

 small, rounded, dark blue blotch behind axilla; 

 frontal divided transversely. (Subgenus Uta). 

 cccc. — Dorsal scales shorter, not imbricate, not mucron- 

 ate, often with intervening granules; a dark 

 blue blotch behind axilla, 

 ddd. — Scales on base of tail not imbricate; not 

 unicolor above. 

 ece. — Basal caudals weakly keeled, not or but 

 shortly mucronate; about 113 to 122 dor- 

 sals from interparietal to back of thighs; 

 26 to 30 of largest dorsals equal length of 

 head to back of interparietal plate; gular 

 region bluish. 



U. stellata.— p. 225. 



eee\ — Basal caudals keeled and strongly mucron- 

 ate; about 106 to 116 dorsals from inter- 

 parietal to backs of thighs; 21 to 25 of 

 largest dorsals equal length of head to 

 back of interparietal plate; gular region 



blackish. 



U. palmeri. — p. 221. 



ddd'. — Scales on base of tail imbricate, strongly 

 keeled and mucronate; no dark or light 

 markings above, except rarely a few pale 

 blue dots. 



U. nolascensis. — p. 223. 



cccc'. — Dorsal scales larger, imbricate at least centrally; 



usually without intervening granules; caudal 



scales imbricate, keeled and strongly mucronate. 



dddd. — A distinct dark blue spot or blotch behind 



axilla. 



ecee. — Dorsal scales smaller, average more than 



