12. GONTOCEPHALTTS. 287 



large (in the female distinctly smaller) as the eye-opening ; upper 

 head-scales small, keeled, a little enlarged on the supraorhital 

 region ; a few enlarged conical scales on the temple ; nine to eleven 

 upper and nine to twelve lower labials. Gular sac moderately 

 developed, without serrated ante-'ior edge ; gular scales smaller than 

 ventrals, smooth. Nuchal and dorsal crests continuous, formed of 

 lanceolate spines with smaller keeled ones at the base ; in the male 

 the crest is very high, measuring about the length of the snout on 

 the middle of the back, higher stiU on the nape, where it does not 

 quite reach the line of the posterior borders of the orbits ; in the 

 female and young the crest is much lower and disappears on the pos- 

 terior half of the back. Dorsal scales very small, smooth or feebly 

 keeled, with the points directed upwards and backwards, with 

 irregularly scattered enlarged ones ; ventral scales of moderate size, 

 smooth. Limbs above with feebly keeled scales, which are sub- 

 equal on the arms and legs, more or less unequal on the thighs ; 

 fourth finger slightly longer than third ; the adpressed hind limb 

 reaches the tip of the snout or beyond. Tail strongly compressed, 

 with serrated upper edge ; upper caudal scales smooth or feebly 

 keeled, lower longer and strongly keeled ; length of the tail a little 

 more than twice that of head and body. Olive above, uniform or 

 with more or less distinct dark cross bands ; throat with black spots, 

 more or less distinctly arranged in oblique series converging towards 

 the median line of the pouch ; tail with regular dark annuli. 



Total length 443 miUim. 



Head 36 „ 



Width of head 27 „ 



Body 97 „ 



Fore limb 83 „ 



Hind limb 125 „ 



TaU 310 „ 



Borneo. 



a. (S . Borneo. Marquis G. Doria [P.]. ^ 



6. r? . Borneo. Dr. Bleaker. 1 /tv.^„„ \ 



c. Yg. Borneo. A. R. Wallace, Esq. [0.]. p-^yPes-) 



d,e. c? S . Borneo. J 



6. Gonyocephalus miotympanum. 



Tiaris miotympanum, Oiinth. Proa. Zool. Soc. 1872, p. 592, pi. xxxvij. 

 fig.B. 



Very closely allied to G. liogaster, from which it differs in having 

 the gular and ventral scales feebly keeled. Tympanum much 

 smaller than the eye-opening. Third and fourth fingers equal. 

 Scales on upper surface of limbs equal, strongly keeled. A series 

 of enlarged scales along each side of the back ; no other scattered 

 large scales on the side. Olive-brown, tail with regular dark annuli ; 

 throat without spots. 



