io8 



many enlarged ones, of which the largest sometimes form a 

 longitudinal series along each side at the base of the dorsal 

 crest, and the others form transverse series; ventral scales 

 much larger than dorsals, smooth. Tail strongly compressed, 

 with a crest at the basal part, gradually decreasing, caudal 

 scales keeled, the inferior strongly keeled; its length not quite 

 twice that of head and body. Limbs long, the adpressed hind 

 limb reaches the eye ; scales of limbs large, slightly unequal, 

 keeled, third and fourth fingers equal. 



Olive or ereenish above, with indistinct brownish transverse 

 bands; gular fold black. Limbs and tail with dark and light 

 transverse bands. Lower parts yellowish or olive. Length of 

 head and body 140 mm.; tail 235 mm. (the end broken). 



Habitat: Sumatra (Deli!, Agam, Si Rambc near Lake 

 Toba, 1200 M., Singkarah!); Borneo (Santubong). 



II. Gonyocephalus dilophus (Dum. & Bibr.). 



Lophyyus dilophus^ Dum. & Bibr., Eip. Gen. IV 1837, p. 419, pi. XLVI. 

 Gonyocephalus dilophus^ Boulenger, Cat. Liz. I 1885, p. 290 (s. syn.). 



Snout as long as the diameter of the orbit; canthus rostralis 

 sharp ; supraciliary borders normally raised ; tympanum about 



as large as the eye-opening. 

 Head-scales very small, keeled ; 

 a series of enlarged scales 

 between the eye and the ear 

 and one bordering the ear 

 anteriorly; a group of enlarged 

 keeled scales below the ear; 

 occipital enlarged; eleven up- 

 per and lower labials. Gular 

 sac very large, the anterior 

 edge with large compressed 

 scales; gular scales very small, 

 keeled, with scattered enlarged 

 ones. Body compressed ; nuchal crest separated from dorsal, 

 beginning at the occiput and formed of nine or ten lanceolate 

 scales, the anterior very small, the posterior longer than the 

 snout ; it is covered at the base with a fold of the skin, bearing 

 small keeled scales; dorsal crest somewhat lower, continued 

 on the tail. Dorsal scales very small, keeled, the points turned 



Fig. 50. Gonyoccplialus dilophus (D. B.) 

 Young specimen. Head with gular sac. 



