12. aONTOCBPHALTTS. 289 



Snout as long as, or slightly longer than, the diameter of the 

 orbit ; canthus rostrahs and supraciliary edge projecting ; tym- 

 panum smaller than the eye-opening; upper head-scales small, 

 keeled, a little enlarged on the supraorbital region ; a few enlarged 

 conical scales on the temple; eight or nine upper and nine to 

 eleven lower labials. Gular sac rathar small, without serrated an- 

 terior edge ; gular scales strongly keeled, smaller than ventrals, 

 intermixed with a few enlarged ones. Nuchal and dorsal crests 

 continuous, formed of lanceolate spines with smaller keeled ones at 

 the base ; in the male the crest is high, measuring the length of 

 the snout on the nape, gradually decreasing in height on the 

 back ; the crest much lower in the female, almost absent in the 

 young ; anteriorly, the crest does not quite reach the line of the pos- 

 terior borders of the orbits. Dorsal scales very smaU, smooth or 

 feebly keeled, with the points directed upwards and backwards, 

 with irregularly scattered enlarged ones ; ventral scales of moderate 

 size, strongly keeled. Limbs above with unequal strongly keeled 

 scales ; third and fourth fingers equal; the adpressed hind limb 

 reaches the anterior border of the orbit or the nostril. Tail strongly 

 compressed, with slightly serrated upper edge; caudal scales all 

 keeled, largest inferiorly ; length of the tail nearly twice that of 

 head and body. Olive above, uniform or with dark cross bands ; 

 tail with regular dark annuU ; throat without, or with rather in- 

 distinct, oblique blackish lines. 



Total length 326 miUim. 



Head 33 „ 



Width of head 22 „ 



Body 78 „ 



Fore limb 59 „ 



Hind limb 90 „ 



TaU 215 „ 



Philippine Islands. 



a, 6-c. 2 & yg. Philippines. H. Cuming, Esq. [0,1 (Types.) 



d-f. cJ $ . Philippines. H. Cuming, Esq. [C.]. (Types 



of T. petersii.) 



10. Gonyocephalus semperi. 



Lophyrus (Tiaris) semperi, Peters, Mon. Berl. Ac. 1867, p. 16. 



Nuchal crest high, not continuous with the dorsal, which is much 

 lower The enlarged dorsal scales forming on each side a regular 

 series paraUel with the dorsal crest. Ventral scales strongly keeled. 

 Olive-brown or greenish-grey above, uniform in the adult, trans- 

 versely barred with brown in the young; gular sac brownish, or 

 marbled with bluish ; borders of the eyeUds and infraorbital border 

 white; tail with broad brown annuli. 



Philippine Islands. 



