Ichnotropis. 183 



Body moderatel}' depressed. Head rather feebly depressed, li to 

 If times as long as broad, its depth equal to the distance between the 

 anterior corner or the centre of the eye and the tympanum, its length 

 3f to 4 times in length to vent in males, 4J to 4t times in females ; 

 snout pointed, as long as the postocular part of the head, with sharp 

 canthus and concave loreal region ; a rather deep concavity on the 

 upper surface of the snout and on the frontal, between two sti'ong 

 keels ; an obtuse keel below the eye. Pileus 2 to 2 J times as long as 

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

 hind limb reaches the axil or the shoulder in males, the elbow or the 

 axil in females ; foot as long as or a little longer than the head ; 

 digits feebly compressed Tail 1 J to 2 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 as long as broad or a little broader than long ; 

 prefrontals much longer than broad, usually in contact with the 

 anterior of the two large supraoculars, and forming an extensive 

 median suture * ; frontal as long as or a little shorter than its distance 

 from the end of the snout, 2 to 2^ times as long as broad, of equal 

 width throughout or a little narrower behind than in front ; parietals 

 li to 2 times as long as broad, rounded or obliquely truncate behind ; 

 interparietal as large as or larger than the frontoparietals, usually in 

 contact with a shorter occipital, which may be large or small, and the 

 posterior border of which is rounded and projects beyond the parietals ; 

 occipital exceptionally broken up into scales. 4 supraoculars, the 

 first small or broken up into 2 to 5 shields; anterior large supraocular 

 longer than its distance from the second loreal, second usually in 

 contact with the parietal ; 4, rarely 5, superciliaries, first longest and 

 forming a very oblique sutui-e with the second ; one, rarely two, series 

 of small 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 much shorter than second; 

 4, rarely 5 or 6, upper labials anterior to the subocular, which is 

 much narrower beneath than above, and borders the mouth. t An 

 enlarged upper temporal usually present, sometimes separated from 

 the parietals by small shields ; temporal scales rather large, hexagonal, 

 strongly keeled ; a narrow tympanic shield. Lower eyelid with a 

 series of vertically enlarged scales in the middle. 



6 pairs of chin-sjiields, the 3 anterior in contact in the middle ; 



* Separated by two azygos shields in a male from Caconda. 

 t In a male from Caconda, the lower part of the rischt subocular is cut off to 

 form an additional upper labial. 



