NO. 1992. TALE PERUVIAN EXPEDITION, REPTILES— STEJKEGEB. 545 



Class REPTILIA. 



Suborder SAURIA. 



STENOCERCUS ERVINGI, new species. 



Diagnosis. — Posterior dorsal scales considerably smaller than ven- 

 trals; caudal scales nnich longer than ventrals, not spinose; anterior 

 border of ear without spines or lobules. 



Habitat. — ^Peru . 



Type-specimen. — Cat. No. 49550 U.S.N.M.; Huadquinia, Peru, 

 5,000 feet altitude; wet season, 1911. 



Description of type-specimen. — No pterygoid teeth; scales on top 

 of head small, fiat, pitted; two rows of scales on interorbital space; 

 two rows of large, supraocular scales, those of the inner row broader 

 than long; occipital smaller than those surrounding it; anterior 

 border of ear smooth, without projecting spines, the scales forming 

 the margin not differentiated in any way; sides of neck longitudinally 

 folded; underside of neck smooth; a strong vertical fold in front of 

 the humerus; body rather depressed; dorsal scales small, obtusely 

 keeled, not mucronate, those on median line slightly larger but form- 

 ing no denticuiation, the lateral ones anteriorly granular, increas- 

 ing in size toward the median line and posteriorly, the largest ones 

 considerably smaller than the ventrals and much smaller than the 

 caudals; sides of neck and body finely granular; gular scales small, 

 but much larger than lateral granules; ventrals considerably larger 

 than largest dorsals, rounded, imbricate, smooth; adpressed hind 

 leg reaches the eye; fifth toe nearly as long as second; legs above 

 with keeled scales larger than largest dorsals; tail about one-third 

 longer than head and body, cylindrical, covered with distinct rings 

 of strongly keeled, blunt scales almost twice as large as ventrals. 

 Color (in alcohol) above greenish gray, marbled with dusl^ and 

 speclded with whitish rounded dots; a narrow, blackish, transverse 

 band, edged behind with larger nearly continuous whitish spots 

 from one humeral fold to the other, barely interrupted on the dorso- 

 median line; legs and tail above cross barred with dusky; throat 

 greenish white with darker bluish-green marblings on the side of 

 neck; underside whitish. 



Dimensions. 



mm. 



Total length 84 



Tip of snout to vent 35 



Vent to tip of tail 49 



Tip of snout to ear ; . . 10 



Width of head 7 



Fore leg 17 



Hind leg 26 



80459°— Proc.N.M.vol.45— 13 35 



