Icliiiotroiny. 180 



region ; a feeble concavity along the upper surface of the snout and 

 the frontal shield ; a strong keel below the eye. Pileus twice as long 

 as broad. Neck as broad as or a little narrower than the head. The 

 hind limb reaches the ear or between the enr and the eye ; foot 1^ to 

 Ij. times the length of the head ; digits feebly compressed. Tail 2 to 

 '2i times as long as head and body. 



Upper head-shields strongly and coarsely striated and keeled ; 

 nostril between three shields ; nasals forming a suture behind the 

 rostral ; frontonasal broader than long ; prefrontals longer than broad, 

 not reaching the first supraocular, forming an extensive median 

 suture; frontal as hmg as or a little shorter than its distance from 

 the end of the snout. If to 2 times as long as broad, narrower behind 

 than in front ; parietals longer than broad, rounded behind ; inter- 

 parietal as lai-ge as or a little larger than the frontoparietals, in 

 contact with a much shorter occipital, the posterior border of which is 

 rounded and projects beyond the parietals. Two large supraoculars, 

 first longer than its distance from the second loreal, from which it is 

 se])arated by one, two, or three small keeled shields ; one or two 

 small jjosterior supraoculars ; 4 superciliaries, first longest and forming 

 a very oblique suture with the second ; a series of granular scales 

 between the supraoculars and the superciliaries. Lower nasal broadly 

 in contact with the rostral ; postnasal small, between the upper and 

 lower nasals ; anterior loreal shorter than the second ; 4 upper labials 

 anterior to the subocular, which is much narrower beneath than above 

 and borders the mouth. A large upper temporal ; temjjoral scales 

 rather large, hexagonal, strongly keeled ; a narrow tympanic shield. 

 Lower eyelid with a series of vertically enlarged scales in the middle. 



5 pairs of chin-shields, the o anterior in contact in the middle ; 

 gular scales imbricate, passing gradually into the ventral plates, 21 to 

 23 in a straight median line. 



Dorsal scales lanceolate, strongly keeled, acutely pointed or shortly 

 mucronate, nearly as large as the upper caudals ; lateral scales not 

 smaller, smooth towards the ventral plates, into which they pass 

 gradually ; ventral plates rounded-hexagonal, not broader than long, 

 in 10 longitudinal and 26 or 27 transverse series ; 36 or 38 scales and 

 plates round the middle of the body. Preaual region covered with 

 irregular scales. 



Scales on limbs smaller thau dorsals, strongly keeled, tri- or Cjuinque- 

 cai-iuate ou the arm. 9 or 10 femoral pores on each side. Sub- 

 digital lamellae pluricariuate, spiuulose, 19 to 21 under the fourth toe. 



Caudal scales strongly keeled, upper similar to dorsals. 24 to 28 in 

 the fourth or fifth whorl behind the postanal granules. 



