10. VTA 183 



well-developed 5 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. x o. symmetrica. p 202. 



". Series of enlarged dorsal scales not con- 

 tinued anterior to insertions of forelimbsj 

 dorsolateral tubercles much reduced, some- 

 times nearly absent 5 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 j 



frontal plate usually divided transversely. 

 U. graciosa. p. 212. 



dd'. Tail less than twice length of head and bodyj 

 dorsals becoming more gradually smaller 

 laterally 5 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. 



