6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 92 



fellow by a single small scale followed by anotber of about the same 

 size ; superciliary spine moderate in size ; three large supralabials to a 

 point below the center of the eye ; a very large anterior inf ralabial, a 

 smaller second and part of a third inf ralabial to the same point ; top of 

 head covered with granules which are relatively large, hexagonal, and 

 very faintly keeled or smooth on the snout, more elongate and heavily 

 keeled between the eyes, and much smaller but still distinctly keeled on 

 the occiput ; scales of back keeled, imbricate, nine in the distance be- 

 tween tip of snout and center of eye ; no middorsal granular zone ; 

 laterals irregular, only slightly larger than dorsals, about seven to 

 seven and a half lateral scales in the standard distance ; mental a trifle 

 longer than rostral, followed by two enlarged postmentals ; scales of 

 gular region small, slightly tubercular and indistinctly keeled only at 

 the level of the commissure of the jaws, becoming smooth and imbri- 

 cate on the throat ; scales of chest and belly smooth, rounded, imbricate, 

 about seven ventral scales to the standard distance, not perfectly 

 regular in size ; scales of limbs anteriorly and below like those of the 

 belly, much smaller and granular posteriorly ; 14 smooth lamellae 

 under the fourth toe; scales of tail (reproduced) above keeled, 

 imbricating, below smooth, enlarged transversely into a series of wide, 

 rather irregular plates. A triangular "escutcheon" of differentiated 

 scales about five scales long by nine wide, which projects only for a 

 distance of one or two scales on the femur. 



Di4ncnsioiis.—liea.d and body, 25 mm; tail (reproduced), 21 mm; 

 width of head, 5 mm ; tip of snout to ear, 6.5 mm ; foreleg, 7 mm ; hind 

 leg, 10 mm. 



Coloration in alcohol. — Head drab, upper part of body mouse-gray, 

 tail pale olive-buff ; numerous sepia spots one scale in width beginning 

 between the shoulders, indistinct on the anterior half of the back but 

 becoming very apparent on the tail. Lower parts pale olive-buff, with 

 very minute dark punctulations on the belly and on the posterior edges 

 of the transversely enlarged plates beneath the tail. Fore limbs very 

 indistinctly, hind limbs rather distinctly spotted above. 



Parafypcs. — Five specimens, a female (U.S.N.M. no. 81758), three 

 males (nos. 81757, 81760, 81761) and a very young one (no. 81756) 

 were taken at the same place and time as the type. 



Variation. — In size of scales there is little variation, all of the 

 adults having nine dorsals in the standard distance. The keels on the 

 scales of the throat below the corner of the mouth are as distinct in 

 two adults as they are in the type, but are less distinct in the other two 

 examples. The crescentic grooves on the rostral are fairly well de- 

 veloped in two specimens, but are scarcely apparent in the others. In 



