18. CNEMIDOPHORUS 537 



The color above is yellowish or grayish brown, irregu- 

 larly marbled with dark brown or black, which dark mark- 

 ings usually form more or less irregularly broken bands or 

 longitudinal rows of spots. These dark markings may take 

 the form of reticulations on the back and sides without any 

 longitudinal markings. The upper surfaces of the limbs 

 are brown or grayish olive, nearly unicolor or spotted or 

 reticulated with black or dark brown or light bluish gray. 

 The sides of the head and neck are marked with numerous 

 large, often poorly defined, black or brown blotches and 

 sometimes with whitish spots. The tail is yellowish, green- 

 ish, or olive brown above, darkest along the keels of its 

 scales. The gular region is gray, yellow, slate, or black, 

 unicolor or dotted, spotted, marbled, or reticulated with 

 black. The lower surface of the body is bluish, greenish or 

 yellowish, sometimes without dark markings but usually with 

 more or less black along the margins of the plates, and often 

 heavily suffused with black on the chest. The lower sur- 

 face of the tail is blackish or bronze, often lighter toward 

 the base and sometimes with the two median series of plates 

 marked with black. 



Length to anus 53 



Length of tail 148 



Snout to ear 1 3 



Snout to interparietal 1 



Width of head 8^ 



Fore limb 18 



Hind limb 38 



Base of fifth to end of 



fourth toe 19 21 2+ 2+ 24 24 



Distribution, — San Esteban Island, Gulf of California, 

 Mexico. 



