194 BULLETIN 17 7, UNITED STATES NATIONAL MUSEUM 



the mental and infralabials, merging with the other throat scales 

 posteriorly; temporal region with tubercular keeled scales; a series of 

 very apparent folds on the side of the neck and in front of the shoulder, 

 continuing downward to the gular fold and backward along the side 

 to the groin, not covered by differentiated scales; scales in front of 

 tympanum tubercular and slightly keeled, but not projecting; 

 tympanum nearly as large as eye opening. 



Body moderately stout, not depressed, its dorsal surface covered 

 with tubercles intermingled with very minute granules, the five or 

 six dorsal rows enlarged into imbricate, keeled scales; a very definite 

 nuchal patch of enlarged keeled scales about 15 scales long by 17 

 wide, the row on each side of the midline a little smaller; a slight nuchal 

 ridge diminishing on the body; laterals granular, small, not differ- 

 entiated from the dorsolaterals; chin covered with elongate keeled 

 scales in regular longitudinal rows; a very pronounced longitudmal 

 gular fold, and a series of wrinkles on each side of it representing the 

 traverse fold, covered mostly by granular scales; chest and belly 

 covered with keeled imbricate scales like those of longitudinal gular 

 fold; a series of four enlarged postanal scales in the male; tail com- 

 pressed, apparently not prehensile, faintly verticillate, with three 

 rows of smaller keeled scales between verticils on the side of the tail, 

 and about three enlarged scales to a verticil on top, the profile not 

 serrate; limbs granular posteriorly, the other surfaces scaled like the 

 belly; digits dilated and depressed, about 32 lamellae under the free 

 part of the fourth toe. Hind limb being adpressed, tip of fourth toe 

 reaches to anterior border of eye. 



Dimensions: Snout to vent, 58 mm.; tail, 116 mm.; hindleg, 49 

 mm. ; foreleg, 27 mm. ; width of body, 13 mm. ; depth of body, 13 mm. ; 

 width of head, 14 mm.; snout to posterior border of tympanum, 

 19 mm. 



Color (in alcohol): Entire upper surfaces uniform slate-black; 

 ventral surfaces light drab, with a very heavy, uniform powdering of 

 slate-gray on all the scales. 



Paratypes.—M.Q.Z. Nos. 44366 and 44367 and U.S.N.M. No. 

 107558, from the same locality as the type; M.C.Z. No. 44373 and 

 U.S.N.M. No. 107563, from Loma Rucilla, altitude 8,000 to 10,000 

 feet, collected in June 1938 by P. J. Darlmgton; M.C.Z. Nos. 44368- 

 44372 and U.S.N.M. Nos. 107559-107561, from Loma Pelona (near 

 Loma Rucilla), June 1938, P. J. DarUngton. 



Variations. — In the paratypes the number of scales between the 

 nasals is five to seven, subequal or with the median scales much 

 smaller, as in U.S.N.M. No. 107558. The loreal rows are three in 

 number, with a single scale representing a fourth "row" as in U.S.N.M. 

 No. 107560, or with four or five distinct rows and one or two additional 

 scales below the canthus. The frontal group of scales between the 



