234 REPORT OF NATIONAL MUSEUM, 1898. 



internally, and riuiniug forward distinctly between the nostrils, Nos- 

 trils more superior tbaii lateral; inside of the canthus rostralis, which 

 extends nearly to end of snout. Cephalic plates all longitudinally 

 rugose or carinated. Xo crest on back or tail. Tail rounded. Scales 

 on body and sides small, paved, slightly angular, and about equal; 

 those of belly larger, oval, carinated. Large scales of the leg confined 

 chietiy to the anterior surfaces. 



Color green or brown above, whitish beneath. Cheeks with a long 

 dusky spot. Upi^er parts sometimes blotched with dusky, as also occa- 

 sionally the inside of legs. Chin with three dotted lines on each side 

 interrupted anteriorly. 



Head very large, forming nearly or quite one-third of the distance 

 from suout to anus; much depressed and pyramidal; the sides plane, 

 straight, and convergiug to near the rounded tip, and perpendicular to 

 the j)lane upper surface. The width is about one-half the length to 

 tlie ear. JTostrils entirely superior and internal to the canthus rostralis, 

 opposite the junction of the first and st^cond labial. Upper surface of 

 head with ten ridges more conspicuous with age, which begin as a 

 posterior and inner border to the supraorbital region, wider a little in 

 front of this, and then converge until they meet between the nostrils. 

 All the plates on the head large and longitudinally wrinkled. The 

 cephalic ridges are composed each of about twelve plates, which, with a 

 few intermediate ones, are the largest on the head. The supraorbital 

 space exhibits five or six large plates in two series (the inner largest) 

 and bordered internally by one row, externally by thirteen or fourteen of 

 small tubercular jilates. The canthus rostralis is formed by six sharp, 

 long, imbricated plates; the side of the head below this to the labials is 

 longitudinally excavated, the space occupied behind by five rows of 

 nearly equal plates. The rostral is very broad, but low. There are 10 

 long, low, upper labials and about 11 lower; there is no median plate at 

 the end of the lower jaw. The lower labials are margined by several 

 series of elongated narrow plates, three or four anteriorly and a larger 

 number behind, the third larger than the rest. All the other plates 

 on the under surface of the head are small, elongated, tubercular, and 

 paved. The scales are all small and nearly uniform on the back and 

 sides, where they are tubercular, rounded, slightly carinated, but not 

 imbricated. The belly scales are larger, more imbricated and rhom- 

 boidal, more carinated. The scales on the legs resemble those of the 

 sides, except on the anterior faces when the limbs are folded and drawn 

 up, where the scales are larger, imbricated, carinated, and acute. The 

 scales on the tail are larger, strongly carinate, and in whorls. It is 

 about twice the head and body, compressed and much attenuated, 

 with a central series of larger scales along the upper edge. The hind 

 leg brought forward reaches to the lower jaw; the hind foot is two- 

 thirds the head, and is contained about four times in the head and 

 body. It is about equal to the fore leg from the elbow. The fifth hind 



