Remarks. — This species is a member of the U. stans- 

 buriana group but is easily distinguished by the absence of 

 the postaxillary blue blotch and the small size of its dorsal 

 scales. The postaxillary blotch is entirely wanting, while 

 in U. squamata a trace of it may sometimes be seen. 



Although described from Carmen Island specimens, 

 those from Danzante and Coronado islands seem identical. 



Distribution. — Carmen, Danzante and Coronado islands. 

 Gulf of California, Mexico. 



Genus 1 1 . Sator 



Sator DicKERSoN, Bull. Amer. Mus. Nat. Hist., Vol. XLI, 1919, p. 468 

 (type, grandtevui) . 



The head is little depressed. The body and tail are 

 somewhat compressed, and there may be a slight vertebral 

 elevation or ridge. The tail is more than twice as long as 

 the head and body and is covered with large, keeled, muc- 

 ronate scales. The head-plates are moderately large, the 

 interparietal and frontal largest. The dorsal scales are 

 large, of nearly equal size, strongly keeled, mucronate, and 

 strongly imbricate. The ear-opening is large, with a well- 

 developed anterior denticulation. The labials are juxta- 

 posed. A more or less well developed transverse gular 

 fold usually is present but may be absent. There is little 



