224 
MR. W. T, BLANKOKD ON RKlTfLES 
[Feb. 1, 
ferred to this form, although they differ somewhat from the Austra- 
lian types. One is a fine esnmplcf li4 inches long ; the other is 
younj^j and measures but lfi| inches. Both have only 39 scales 
round the neck, instead of from 43 to 4 7 ; hut 1 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 aUernatiiig black and yellow rings quite round the botly ; the 
younger has the black rings not quite perfect. 
nYDItOt>HIS VIPERINA. 
Jlydro^ihu mperiim^ Giinther, Rept. Brit. Ind* p. 378 ; Anderson, 
P. St. S. 1872. p, <mh 
The single specimen sent Is 26 inches long. The colour diflfers 
but little from that of the much smaller type iu the British Museum. 
Trimekesurus 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 trnnsverse 
bands are very indistinct, black scales, yellow scales, aiid black-edged 
scales being intermingled. 
There is also a smaller Trimeremrm, l/ i 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 C scales apart from each other, arranged in a line down 
each side of the back. This agrees with T, macuiatun, Gray, said by 
Giinther, Rept, Brit. India, p. 388, to be the young of T. waglen. 
I find, however, in the British-Musemn 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. macuhilus, have, the one 21, the other 22 
scales round the middle of the body. It is evident the number in 
thia species varies from 21 to 25, if I', tnaculatu^ is really the same 
as T. wugleri. In all adult or nearly adult specimens of the tatter 
I find 25 rows of sealee. 
Rhacophorus oknnysi, sp. nov. (Plate XXI. fig. 3.) 
Size of i?. maximus. Colour above, in spirits, dark violet, almost 
slaty, below dirty white mottled with dusky, a brown spot behind 
the occiput. The tympaimm is very httJe smaller than tiie eye. 
The nostril opens backward. The web between the toes without dark 
spots and deeply emarginate ; it extends to the jiads 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 ^ngera are incomplet^ti/ 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 ia flat as in M. reinwtirdti^ and has not 
a tubercle beneath it as in R, majrimus. Folds along the edges of 
