184 Mr. G. A. Boulenger on new 



grey, the throat usually with a dark ^rey network ; anal re^'ioii 

 and lower surface of hind liiubs briglit yellow in thi males, 



uiilliin. 



Total length 238 



Head 20 



Width of head U 



Bodv 63 



Fore liuil) 30 



Hind liiub 51 



Tail 155 



Numerous specimens from Carao, 8000 feet, Iluaras, 

 10,000 feet, and Recuay, U,000 feet. 



Distinguished readily from the preceding species by the 

 granular patches on the sides of the neck. 



Tropidurus Thomasi. 



Upper head-scales smooth ; a series of four to seven trans- 

 versely enlarged supraoculars ; occipital very large, broader 

 than long, at least as broad as the supraocular region ; nostril 

 above the canthus rostralis ; ear-opening with a fringe of 

 lung pointed scales ; temple granulate. A strong curved 

 antthun;eral fold, nearly meeting its f.-llow on the throat ; 

 latter with move or less distinct cross folds; sides of neck 

 minutely granulate, strongly plicate. Boily depressed, with 

 a more or less distinct fold along the side, and a vertebral 

 scries of enlarged tectiform scales, forming a low crest on the 

 nape; dorsal scales very small, juxtaposed, feebly keeled, 

 .smaller still, granular, and smooth on the sides ; ventrals 

 larger, in.bricate, smooth. The bind limb reaches the ear or 

 between it and the antehumeral fold. Tail about once and a 

 half as long as head and body, rounded or feebly compressed, 

 with a low seriated dorsal ridge; caudal scales much larger 

 than dorsals, keeled and shortly mucronate. Grey above, 

 dotted with blackish and yellowish white, the dots having a 

 tendency to forming transverse series; antehumeral fold 

 black ; throat and breast black in the males. 



luilliin. 



Total length 165 



Head 15 



Width of head 13 



Body 51 



Fore limb 27 



Hind limb 45 



Tibia 99 



Several specimens from Eton, coast of Peru, 



