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Show 224 MR. W. T. BLANFORD ON REPTILES [Feb. 1, ferred to this form, although they differ somewhat from the Australian 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, Gunther, 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 prevailing 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 phalanx of the third or longest digit is quite free. The projection on the inside of the inner ringer is flat as in R. reinwardti, and has not a tubercle beneath it as in R. maximus. Folds along the edges of |