150 MR. O. THOMAS ON SMALL [Feb. 15, 



reaches between the eye and the nostril. The inner metatarsal 

 tubercle is smaller than in R. schlegeli, and quite flat. 



A single specimen, measuring 53 millim. from snout to vent. 



3. MiCROHYLA FISSIPES, Blgr. 



C AU DATA. 



4. MoLGE PYRRHOGASTRA, Boie, var. ENSiCAUDA, Hallow. 

 Triton suhcristatus (ensicauda), Hallow. I. c. p. 494. 



These specimens (ten in number) appear sufficiently different from 

 the Japanese typical form to warrant a varietal distinction. The 

 head is proportionally somewhat broader, the digits shorter, and the 

 tail, in the female, longer. The lower parts are yellow (not red), 

 immaculate or more or less spotted with black ; digits yellow 

 inferiorly (black in the typical form). Upper parts black, in some 

 specimens with scattered small yellowish or pale green spots ; 

 sometimes a yellowish vertebral streak. 



millim. millim. 



Total length 115 158 



From snout to cloaca 53 70 



Head 13 15 



Width of head 12 14-5 



Fore limb 20 21 



Hind limb 20 23 



Tail 62 88 



EXPLANATION OP THE PLATES. 



Plate XVII. 



Fig. 1. Japalura polygonata, p. 146. 



2. Tachydromus smaragdinus, p. 147. 



Plate XVIII. 



Fig. 1. Tachydromus smaragdinus. Tipper view of head, X 2. 



2. Lygosoma pellopleiirum ; and upper view of head, X 2, p. 147. 



3. Tropidonoius pryeri, p. 149. 



3. On the small Mammalia collected in Demerara by 

 Mr. W. L. Sclater. By Oldfield Thomas. 



[Eeceived January 29, 1887-] 



(Plate XIX.) 



The Mammalia obtained by Mr. W. L. Sclater during his recent 

 visit to British Guiana consist of 13 specimens belonging to 8 

 species, of which one is new. All of them liave had their exact 

 localities and dates recorded, and are therefore of interest even when 

 belonging to common species. Tiie discovery of a new species of the 



