276 3. IGUANID.^ 



with blue, v/ith a tendency to the formation of narrow 

 oblique bands on the chin and throat. Females and young 

 usually have little blue on the throat and sides of belly. 



Length to anus 57 5 8 61 61 63 63 



Length of tail 90 79 74 85 80 86 



Snout to ear 12^ 12 liyi 13 13 12>4 



Width of head Wyi WYi 11 11 12 W/i 



Snout to back of 



interparietal 11>^ 11^ 12 12>4 W/i 12 



Fore limb 26 24 24 25 26 27 



Hind limb 43 39 40 43 42 43 



Base of fifth to end of 



fourth toe 17 15 16 17 16 17 



Remarks. — Specimens from Utah and eastern Idaho may 

 very readily be distinguished from 5. g. gracilis from Cali- 

 fornia and western Oregon by the difference in size of the 

 dorsal scales, which are much larger in the Utah lizards. 

 Utah specimens also differ in usually having a small patch 

 of keeled scales on the back of the thigh where 5. g. gracilis 

 has smooth granular scales. The coloration of 5. g. gra- 

 ciosus usually is brighter than that of S. g. gracilis and S. g. 

 vandenbtirgiatms, the dorsal and lateral blotches and longi- 

 tudinal bands being more distinct. As one crosses Idaho and 

 Nevada from east to west the dorsal scales become smaller. 

 Keeled scales on the back of the thigh are present in speci- 

 mens from Bingham and Lincoln counties, Idaho, but not 

 in those from western Elko and southern Lander counties, 

 Nevada. The coloration of these specimens is similar to that 

 of Utah lizards. All specimens from Nevada, western 

 Idaho and eastern Oregon are more or less intermediate 

 between S. g. graciosus and 5. g. gracilis, but are best refer- 

 red to the former, with the exception of some from south- 

 western Nevada. Specimens from Warner and Abert lakes. 

 Lake County, Oregon, are best regarded as S. g. graciosus, 



