II. SATOR 255 



or no differentiation of scales on this fold, but its situation 

 may be indicated by one or two rows of smaller scales. The 

 lateral scales are very small or granular and a longitudinal 

 dermal fold extends along the side between the limbs. Fe- 

 moral pores are numerous. The superciliaries are imbri- 

 cate. Males do not have large postanal plates, although 

 some specimens show slightly enlarged ones. 



This genus includes two species from islands in the Gulf 

 of California. It is related to both Uia and Sceloforus. 

 The compressed body and tail, the larger dorsal scales, and 

 the lack of a well differentiated gular fold, distinguish it 

 from Uta. Unlike Sceloporus, it has a lateral fold and usu- 

 ally a more or less definite gular fold. It differs from both 

 these genera in the absence of enlarged postanal plates in 

 males. Its closest relative is perhaps, Sceloporus utiformis, 

 of the Mexican mainland, which has very small lateral 

 scales and may have a lateral fold but no gular fold. 



Synopsis of Species 

 a. — Temporals mostly smooth or conical, keeled only over 

 ear; lateral scales on middle of body larger, keeled, 

 changing gradually to larger dorsals and ventrals; 61 to 

 15 scales in a row between interparietal and backs of 

 thighs; femoral pores 11 to 17, average 13.43; belly 

 with lateral blackish cross-bars in males. 



S. angustus. — p. 256. 



a'. — Temporals mostly strongly keeled; lateral scales on 

 middle of body smaller, often granular, changing rather 

 abruptly to larger dorsals and ventrals except some- 

 times in a narrow zone at middle of body; 56 to 69 

 scales in a row between interparietal and backs of thighs; 

 femoral pores 14 to 22, average 17.04; belly without 

 lateral blackish cross-bars. 



S. grandaevus. — p. 259. 



