342 TElIDJi. 



anterior part of the back ; females sometimes with a second light 



line along the side ; males with light spots on the flanks ; lower 



surfaces light olive. 



<?. ?. 



millim. millim. 



Total length 291 253 



Head 26 22 



Width of head 16 12 



Body 65 61 



Fore limb 35 34 



Hind limb 67 65 



Tail 200 170 



South America. 



«-^- 6 $ • Demerara Falls. 



c. $. Cayaria, E. Peru. Messrs. Veitch [P. 1. 



d, e. (S 2' Sarayacu, Peru. Messrs, Veitch [P.J. 



4. Centropyx pelviceps. 



Centropyx pelviceps, Cope, Proc. Ac. Philad. 1868, p. 98. 

 dorsalis, O'Shaughn. Proc. Zool. Soc. 1881, p. 228. 



Very closely allied to the preceding. The occipital concavity is 

 stronger ; the temj^oral granules and lower femoral scales larger ; 

 femoral pores nineteen to twenty-two. Praeanal scales in both sexes 

 keeled. Dark olive above, with a pale light median band com- 

 mencing on the snout and gradually disappearing on the back ; this 

 band bordered on each side by a broad festooned black band breaking 

 up into spots on the hiud part of the back ; lower surfaces pale 

 green. 



millim. millim. 



Total length 343 348 



Head 31 31 



Width of head 18 18 



Body 82 87 



Fore limb 45 50 



Hind limb 88 91 



Tail 230 230 



Ecuador; N. Peru. 



a-b. 2 ■ Canelos, Ecuador. Mr. Buckley [C.]. 



c. d, (S 2 • Peruvian Amazon. Mr. E. Bartlett, [C.]. 



/. Yg. j • (Stated to be the type of Monoplocus dorsalis.) 



5. Centropyx altamazonicus. 



Centropyx altamazonicus, Co^ye, Jouni. Ac. Philad. (2) viii. 1876, 

 p. 162. 



Dorsal scales very small, hexagonal, smooth, but little larger than 

 the lateral. Ventrals keeled, in sixteen longitudinal and thirty-five 



