28 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 73 



Head very short with obtuse muzzle, with pronounced decurved 

 profile. Eyes large, nostril near end of muzzle, in anterior third of 

 distance between end of muzzle and orbit. Scales on top of muzzle 

 and of frontal region subquadrate or subhexagonal, those of temporal 

 regions but little longer than wide. All are more or less convex,, 

 temporals more so; rostral plate larger than mental. Six rows of 

 scales between nasal plates, some of which are wider than long. Three 

 canthal scales, of which the anterior is horizontally divided in one 

 specimen. Four rows of wide loral scales above four rows of narrow 

 scales above the supralabials. Supralabials, 11-12; sublabials, 14-15; 

 loreals flat. Scales on muzzle larger than parietals; supraorbitals 

 smaller than other head scales and separated from each other by four 

 rows of scales. Dorsal scales small, hardly more than half size of 

 ventrals, gradually increasing in size posteriorly, smooth. Dorsal 

 crest composed of from 75 to 80 carinated scales, beginning just back 

 of head, on neck, and continuing uninterrupted at sacrum, to base of 

 tail. Crest over the sacrum is very low, but is present as raised 

 carinated scales, thereby maintaining median row of raised dorsal 

 spines or crest. In female specimens entire crest is much lower than 

 that of male; those of adult males reaching a height of 5 to 8 mm. 

 Limbs are without heavy spinous scales. Tail is nearly cylindrical, 

 scales on upper side being of two kinds; large spinous scales and 

 small, low, flat scales, arranged in whorls. Median dorsal scales are 

 large and heavily armed throughout length of tail; others are arranged 

 in whorls; some whorls spinous and some flat. In one specimen 

 the first 5 whorls of large spinous scales are separated from each other 

 by 3 rows of small, flat scales; next 9 or 10 whorls of large spinous 

 scales by 2 rows of small, flat scales; while on the terminal three-fifths 

 of tail all of the scales gradually become equally spinous. At base 

 of tail ventral scales are smaller, four rows corresponding to three 

 above, slightly keeled and pointed posteriorly. Toes very long, 

 especially those of hind feet; claws strong and sharp. 



In both specimens femoral pores are small, exceedingly so in female^ 

 which has six pores on each femur. Male has five pores on each 

 femur. Both have distinct transverse gular fold. 



Measurements. — 



Length of head 



Length of body... _.. 



Length of tail 



Total length - 



Width of head over orbits 



U.S.N.M. 



M., No. 



47933 



Mm. 



55 

 195 

 520 

 775 



3$ 



' Part of tail broken ofiE. 



