224 MR. W. T. BLANFORD ON REPTILES [Feb. 1, 



ferred to this form, although they differ somewhat from the Austra- 

 lian types. One is a fine example, 64 inches long ; the other is 

 young, and measures but 16| inches. Both have only 39 scales 

 round the neck, instead of from 43 to 47 ; but I can find no other 

 structural distinction, and a larger series would be necessary in order 

 to show whether this difference is constant. The larger specimen 

 has alternating black and yellow rings quite round the body ; the 

 younger has the black rings not quite perfect. 



Hydrophis viperina. 



Hydrophis viperina, Giinther, Rept. Brit. Ind. p. 378 ; Anderson, 

 P. Z. S. 1872, p. 400. 



The single specimen sent is 26 inches long. The colour differs 

 but little from that of the much smaller type in the British Museum. 



Trimeresurus wagleri. 



There are two specimens of this Snake, 23 and 32| inches in length. 

 Both have 25 scales round the middle of the body. The prevaihng 

 colour in both is gamboge-yellow ; the smaller has narrow yellow 

 rings alternating with much broader bands composed of pale greenish 

 scales with black margins; in the larger specimen the transverse 

 bands are very indistinct, black scales, yellow scales, and black-edged 

 scales being intermingled. 



There is also a smaller Trimeresurus, \7\ inches long, with but 

 21 rows of scales round the middle of the body, grass-green above, 

 with very minute subdistant spots, white in front, brown behind, 

 about 5 or 6 scales apart from each other, arranged in a line down 

 each side of the back. This agrees with T. maculatus, Gray, said by 

 Gunther, Rept. Brit. India, p. 388, to be the young of T. wagleri. 



I find, however, in the British-Museum collection, specimens, 

 chiefly from Borneo, that appear to show a gradation between these 

 widely different forms. Two of the smaller specimens from Borneo, 

 with the coloration of T. maculatus, have, the one 21, the other 22 

 scales round the middle of the body. It is evident the number in 

 this species varies from 21 to 25, if T. maculatus is really the same 

 as T. wagleri. In all adult or nearly adult specimens of the latter 

 I find 25 rows of scales. 



Rhacophorus dennysi, sp. nov. (Plate XXI. fig. 3.) 

 Size of R. maximus. Colour above, in spirits, dark violet, almost 

 slaty, below dirty white mottled with dusky, a brown spot behind 

 the occiput. The tympanum is very little smaller than the eye. 

 The nostril opens backward. The web between the toes without dark 

 spots and deeply emarginate ; it extends to the pads at the end of 

 all the toes of the hind feet ; but it is very narrow near the end of 

 the fourth toe on each side. The fingers are incompletely webbed, 

 the web not extending to the end of any digit ; the terminal pha- 

 lanx of the third or longest digit is quite free. The projection on 

 the inside of the inner finger is flat as in B. reinwardti, and has not 

 a tubercle beneath it as in R. maximus. Folds along the edges of 



