. 
157 
nineteen rows, slightly keeled. Above uniform greenish-brown ; 
below yellowish, with a darker stripe on each side, formed by short 
streaks. 
Hab. Sikkim, Himalaya (7500 feet above the level of the sea). 
Description.—Although the head of the single specimen sent, is 
somewhat injured, and does not admit of a fully detailed description, 
I do not hesitate to found a new genus and species on it, as those 
parts which are in a better state of preservation exhibit peculiarities 
sufficient for its recognition. From some few remarks made by Mr. 
Blyth in Journ. As. Soc. 1855, p. 292, it would appear that he also 
has seen this Snake. He, however, describes it as having seventeen 
rows, and applies to it the name of Herpetodryas helena, Daud., 
which is entirely incorrect, the Snake of Daudin being a common 
species from Ceylon with twenty-seven rows of scales (Cynophis 
helena). 
The head is somewhat elongate, rounded in front and flat above. 
The rostral shield is broader than high, and rounded superiorly ; the 
anterior frontals are pentagonal, one-half the size of the posterior, 
which are bent downwards on the side of the head. The vertical is 
pentagonal, much broader than the superciliary, and not quite twice 
as long as broad ; its lateral margins are nearly parallel, the posterior 
ones very short, and meeting at a right angle. The occipitals are 
slightly elongate and rather narrow, subtruncated posteriorly. Nos- 
tril between two plates; one loreal, one anterior, and two posterior 
oculars; eight upper labials, the third, fourth, and fifth of which 
enter the orbit. There appear to be five temporal shields. Ten 
lower labials, those of the first pair being in contact with each other, 
behind the median shield, which has the posterior margin obtusely 
rounded. Two pairs of chin-shields, the anterior being the smaller. 
The trunk is compressed, especially towards the tail, and slender ; 
it is surrounded by nineteen series of scales, those of the back being 
slightly keeled ; they are rather elongate, and assume a rhombic 
form towards the tail. The ventral and subcaudal plates are bent 
upwards to the sides, but not keeled. Ventrals 216, anal bifid, cau- 
dals 90. 
The two posterior teeth are twice as long as the anteriors, with 
which they form a continuous series; they are not grooved. The 
upper parts are uniform greenish-brown, the lower ones yellowish ; 
the ventrals have an elongate spot on each side. Total length 3 feet 
linch ; length of the head 10 lines, of the tail 9 inches. + 
This species is called after Prof. von Siebold of Munich. 
Rana tresier, Gthr. (Pl. XXVIII. fig. A.) 
Diagnosis.—Tympanum hidden; a strong tubercular fold from 
the eye to the axil, another along each side of the back ; sacral re- 
gion tubercular. Head broad; muzzle obtuse, with the canthus 
rostralis flattened. A slight groove across the occiput, uniting both 
the posterior angles of the eye-lids. Vomerine teeth in two oblique 
series, convergent posteriorly. The fifth toe not quite one-third the 
