10. UTA 183 



well-developed 3 elongate tubercles on dor- 

 solateral line of neck, 

 g. — Enlarged dorsals normally in one definite 

 row on each side anteriorly. 



U. o. lateralis. — p. 199. 

 g'. — Enlarged dorsals normally in more than 

 one definite row anteriorly. 



U. o. symmetrica. — p 202. 

 f. — Series of enlarged dorsal scales not con- 

 tinued anterior to insertions of forelimbs; 

 dorsolateral tubercles much reduced, some- 

 times nearly absent; no elongate tubercles 

 on dorsolateral line of neck. 



U. levis.— p. 208. 

 ccc'. — Dorsal scales of one to three median longitud- 

 inal rows not much smaller than those of rows 

 just external to them. 

 dd. — Tail more than twice the length of head and 

 body; dorsals becoming abruptly smaller ex- 

 ternal to the few central rows of large scales; 



frontal plate usually divided transversely. 

 U. graciosa. — p. 212. 

 dd'. — Tail less than twice length of head and body; 

 dorsals becoming more gradually smaller 

 laterally; frontal usually not divided. 

 ee. — Dorsal scales larger, about seventeen to 

 twenty-four equaling length of head and 

 back of interparietal. 



U. nigricauda. — p. 216. 

 ee. — Dorsal scales smaller, about thirty-two to 

 thirty-four equaling length of head to back 

 of interparietal. 



U. microscutata. — p. 219. 



