Habitat: Mentawei Islands (Sipora) ; Sumatra (Deli !, Battak 

 Highlands 800 1000 M., Singkarah!, Padang, Bencoolen); 

 Banka!; Natuna Islands; Java! (Sindanglaia, Sukabumi, Tji- 

 bodas, Tjisurupan, Willis Mts. 5000 feet, Tengger Mts. 1200 M.). 



4. Gonyocephalus sumatranus (Schleg.). 



Lophyrus sumatranus^ Schlegel, Bijdr. tot de Dierk. I 1848, p. 5, pi. Ill fig. I. 

 Gonyocephalus sumatranus, Boulenger, Cat. Liz. I 1885, p. 286. 



Much like the preceding one, but with higher nuchal crest, higher 

 than the length of the snout; it is composed of narrow long 

 scales, covered at the base with four rows of much smaller, but 

 still rather large scales, and begins at the interorbital region ; 

 dorsal crest much lower. Tail one time and three fourths the 

 length of head and body. Limbs long and slender, the hind 

 limb reaches the centre of the eye ; scales of limbs unequal, 

 third and fourth fingers almost equal. 



Olive above, with dark brown transverse bands or reticulated 

 with dark; flanks with brown reticulation; dark lines radiating 

 from the eye ; limbs dark-banded ; tail with regular dark and 

 light annuli. Lower parts yellowish-olive ; throat with indistinct 

 dark longitudinal lines; gular fold brownish. Length of head 

 and body 141 mm.; tail 253 mm. 



Habitat: Sumatra (Deli!, Silago!, Padang!, Palembang). 



5. Gonyocephalus liogaster (Gthr.). 



Tiaris liogaster, Giinther, Proc. Zool. Soc. London 1872, p. 592, pi. XXXVI. 

 Gonyocephalus liogaster, Boulenger, Cat. Liz. I 1885, p. 286. 



Snout longer than the diameter of the orbit; canthus rostralis 

 sharp, projecting; supraciliary border normally raised; tympanum 

 smaller than the eye-opening. Head-scales small, keeled, largest 

 on the supraorbital region ; some enlarged tubercles above 

 and behind the ear; nine to eleven upper and nine to twelve 

 lower labials. Gular sac moderate, without serrated edge and 

 covered with small smooth scales. Body strongly compressed; 

 nuchal and dorsal crests continuous, very high, beginning at 

 the occiput, and formed of long narrow scales, longer than 

 the snout, covered at the base with three rows of smaller 

 keeled ones, the superior row twice as high as the lower. In 

 females the crest is much lower. Dorsal scales very small, 

 smooth or feebly keeled, the points directed upwards, with a 



