94 CALIFORNIA ACADEMY OF SCIENCES. 



the head are very small; largest on the middle third of 

 its length, smallest on the supraocular region. There 

 are twelve superior and twelve inferior labials to below 

 the middle of the eye. All the labials are rectangular, 

 of about equal width, and longer than wide. There are 

 several series of enlarged sublabials, which pass gradually 

 into the granular gulars. The strong gular fold is cov- 

 ered centrally with larger, pointed, imbricate, scales, but 

 has very small granular ones at its edge. The back is 

 covered with small, smooth, weakly pointed, subgranular 

 scales. There is a strong fold along each side of the 

 body between the limbs, and several irregular folds on 

 the neck. The chest and belly are covered with smooth 

 flat scales. The weakly keeled scales on the tail are 

 smaller than the ventrals. There are twenty femoral 

 pores on each side. Male, with enlarged postanals. 



The general ground color is pale hair brown, changing 

 to broccoli brown centrally, finely dotted with white and 

 cream-buff, and with small spots of very dark sepia which 

 increase slightly in size medially and posteriorly. There 

 are two faint pale clay-colored cross-bars on the back 

 above the hind limbs, and several similar ones on the 

 basal portion of the tail. Between these bars are pairs 

 of rather large dark sepia spots, each with a small cream- 

 colored center. The tail has brown rings separated by 

 narrower pale cream-colored ones. The chest and belly 

 are whitish, more or less flecked with slate. The throat has 

 longitudinal olive-gray bands and blotches on a pale cream- 

 colored ground. 



Snout to vent 119 mm. Tail 240 mm. Snout to edge 

 of fold 40 mm. Snout to anterior edge of ear 28 mm. 

 Fore limb 46 mm. Hind limb 89 mm. 



This species has been known from a single specimen, 

 secured at La Paz, by Mr. L. Belding. 



