11. SAT OR 12. SCELOPORUS 261 



Snout to back of 



interparictal 13 16 17 17 17 18 



Width of head 11 14 14 16 14 15 



Fore limb 27 36 35 35 35 35 



Hind limb 44 63 62 64 65 66 



Base of fifth to end 



of fourth toe 19 24 22 24 23*6 24 



Distribution. Ceralbo Island, Gulf of California, 

 Mexico. 



Habits. This lizard was very common on the southern 

 end of Ceralbo Island, where it was found from just back 

 of the beaches up to the heads of the canyons. It was both 

 terrestrial and arboreal, and fed upon insects. 



Genus 12. Sceloporus 



Sceloforus WIEGMANN, Isis, 1828, p. 369 (type, torquatus). 

 Tropdoleps CUVIER, Regn. Anim., Ed. 2, Vol. II, 1829, p. 38. 

 Tropdurus WAGLER, Syst. Amph., 1830, p. 146. 



The head and body are slightly depressed and shorter 

 than the tail. The head-plates are of moderate size, ex- 

 cepting the interparietal which is very large. The dorsal 

 scales are large, nearly equal-sized, mucronate, and strongly 

 imbricate. The ear-opening is large with a well-developed 

 anterior denticulation. The superciliaries are imbricate. The 

 labials are juxtaposed. There is no complete transverse 

 gular fold, but a pouch is present on each side of the neck. 

 There is no dorsal crest. Femoral pores are numerous. 



This genus includes numerous species of North and 

 Central American lizards, of which about 20 kinds occur in 

 western North America. These are all of small or mod- 

 erate size, and often are brilliantly colored. Most of these 



