448 ZOOLOGY. 



punctulated rostral scale, much more broad than high; nos- 

 trils towards the hinder part of a swoUen subovate scale, 

 separated by one or two scales from the rostral. Canthus 

 rostralis and supra-orbital ridge prominent, terminatiag 

 at the nasal scale, Frenal region depressed, covered with 

 small elongate scales. Forepart of the head covered with 

 nearly flat scales, those in the centre a little longer than 

 the others ; occiput covered with flat scales towards the 

 forehead, whilst behind and towards the temporal regions 

 they are slightly keeled. Ear-opening large, nearly equal 

 to the eye. A few spines scattered around it, especially 

 behind eyelid, covered with small scales. Mental shield 

 almost oval, a little broader than high. Supra-labials about 

 14, not extending to the gape, the row of larger scales 

 constituting them being, however, continued backwards, 

 and terminating in a small spine above the gape. Infra- 

 labials 12 — 13, also not extending back quite as far as 

 the gape. Chin covered with small rhomboidal scales 

 decreasing in size backwards. Throat with two or three 

 irregular cross folds. Back not crested, covered with 

 small imbricate scales, those near the centre larger and 

 slightly keeled, especially towards .the front. A few 

 scattered spines of small size between the shoulders. 

 Tail longer than the head and body; scales a httle 

 larger than elsewhere, strongly keeled, disposed in narrow 

 rings in front, but becoming gradually imbricate towards 

 the tip. Scales of the belly small, smooth, rhombic, sub- 

 equal. Pre-anal pores eight in a single row. Third and 

 fourth toes in the fore foot subequal; in the hind foot the 

 third toe is very little shorter than the fourth. Point of 



