Ichnotropis. 183 



Body modei-ately depressed. Head rather feebly depressed, 1-|- 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, 4 J to 4| 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 helow the eye. Pileus 2 to 2 J times as long as 

 broad. ISTeck 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^ 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 



fi-om 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 



l^ 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 usuallv in 



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



forming a very oblique suture 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. 



5 pairs of chin-shields, the 3 anterior in contact in the middle ; 



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

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

 form an additional npper labial. 



