GOKrOCEPHALUS. 123 



reaches the anterior border of the orbit, or between the latter and 

 the nostril. Tail strongly compressed, with serrated npper edge, 

 with keeled scales which are larger interiorly ; the length of the 

 tail a little more than twice that of head and body. Brown or 

 olive above, spotted or reticulated with black on the sides ; some- 

 times a light, dark-edged band along each side of the back. 



From snout to vent 3'25 inches ; tail 8. 



Hah. Andaman and Nicobar Islands. 



128. Gonyocephalus humii. 



Tiaris humei, StoUczka, J. A. S. B. xlii, 1873, p. 167. 

 Gonyocephalus humii, Bouleny. Cat. Liz. \, p. 294, 



Near G. suhcristatihs, but with the crest very much more deve- 

 loped ; the nuchal crest considerably higher than the dorsal. 

 General coloration greenish olive, on the top of the head brownish ; 

 sides of the entire body more or less distinctly and rather densely 

 reticulated and spotted with black and yellow ; sides of head and 

 neck and the gular sac tinged with purplish blue, labials spotted 

 with blue ; chin mostly yellow. 



Head and body 4-4 inches ; tail 11. 



Hah. Tilliugchang Island, Nicobars. I have not seen examples 

 of this species. 



129. Gonyocephalus hellii. 



Lophyrus bellii, Dam. ^- Bibr. Erp. Gen. iv, p. 410 ; Peters, MB. 



Ak. Berl. 1807, p. 16. 

 Gonyocephalus bellii, Bouleng. Cat. Lh. i, p. 288. 



Ty]npanum nearly covered with scales. Upper head-scales 

 small, keeled ; two subconical tubercles on the occiput. Gular sac 

 small, without serrated anterior edge ; gular scales equal, smooth. 

 Nuchal and dorsal crests continuous, commencing on the occiput ; 

 the crest is composed of lanceolate spines with two or three rows 

 of smaller keeled spines on each side at its base, which gradually 

 decrease in size on the back. Dorsal scales small, keeled, with the 

 points turned upwards and backwards, intermixed with enlarged 

 scales irregularly scattered ; ventral scales strongly keeled. The 

 adpressed hind limb reaches nearly the tip of the snout. Tail com- 

 pressed, anteriorly with serrated upper edge ; its length more than 

 twice that of head and body. Brownish above, whitish-spotted ; 

 crest greenish grey ; tail with regular dark annuli. 



iVom snout to vent (! inches ; tail 13. 



Hah. The type specimen in the Paris Museum was stated to be 

 from Beugal. A second specimen has since been received by the 

 Berlin Museum from Ca])t. von Orlich, together with other lieptiles 

 from Bengal. 



