300 AOAHro^. 



B. No spine on the side of the neck. 



Dorsal scales not very unequal in size . . 7. Jcahhienensis, p. 305. 

 Dorsal scales very unequal in size .... 8. major, p. 306. 

 A serrated ridge on each side of the neck, 



parallel with the nuchal ridge 9, tricarinata, p. 306. 



1. Acanthosaura capra. 



Acanthosaura capra, Giinth. Proc. Zool. Soc. 1861, p. 188, and Itept, 

 Brif,. Ind. p. 148, pi. xiv. fig. F. 



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

 supraciliary edge angular ; tympanum smaller than the eye-opening ; 

 upper head-scales small, subequal, keeled ; a long spine, measuring 

 three fourths the diameter of the orbit in the adult, half that dia- 

 meter in the half-grown male, terminates the supraciliary edge ; 

 ten upper and twelve or thirteen lower labials ; gular scales scarcely 

 smaller than the ventrals, strongly keeled. A curved vertical fold 

 on each side of the neck, in front of the shoulder. N^uchal crest 

 not continuous with the dorsal, composed of large compressed spines 

 which are a little longer than the postorbital spine, with the base 

 concealed by two or three rows of smaller spines. Dorsal crest less 

 developed than the nuchal, composed of triangular scales gradually 

 decreasing in size behind. Dorsal scales very small, obtusely 

 keeled, all with the points directed upwards ; a few slightly en- 

 larged ones are scattered among them ; ventral scales larger, 

 strongly keeled. Limbs above with subequal keeled scales ; fourth 

 finger a little longer than third ; the hind limb stretched forwards 

 reaches the temple or the eye. Tail compressed, once and one third 

 to once and a half as long as head and body, covered with uniform 

 strongly keeled scales, which are larger inferiorly. Greenish brown, 

 with indistinct roundish light spots ; throat of the adult blackish 

 brown, with an orange-coloured streak along the middle. 



The largest specimen, a skin, measures about 135 miUim. from 

 snout to vent ; tail 175 miUim. 



The following measurements are taken from the smaller spe- 

 cimen : — 



Total length 178 millim. 



Head 20 „ 



Width of head 15 „ 



Body 53 „ 



Fore limb 47 „ 



Hind limb 60 „ 



Tan 105 „ 



Siam. 



_-6. Ad „ 



c. Ad., stuffed. Chartabomn. M. Mouhot [ 



a-6. Ad. &hgT. cJ. Chartaboum. M. Mouhot ^C.]. (Types.) 



