208. HYDROPHIS. 277 
-body ; scales all imbricate and keeled, the keels feeble on the neck, 
strong on the body. Ventrals very distinct throughout, 314, 
smooth or with two tubercles, Greyish white above, yellowish 
white beneath, with olive cross-bands on the back, wider than the 
interspaces ; a black streak along the ventrals; head entirely black. 
Total length 1200 millim.; tail 90. 
North Coast of Australia. 
a. 2 (V. 314). N. Australia. Capt. King [P.]. 
9. Hydrophis nigrocinctus. 
Russell, Ind. Serp. ii. pl. viv (1801). 
Hydrophis nigrocinctus, Daud. Rept. vii. Pp 380 (1803); Gray, Cat. 
p. 51 (1849); Giinth. Rept. Brit. Ind. p. 368, pl. xxv. fig. L 
(1864) ; Fayrer, Thanatoph. Ind. pl. xxv. (1874) ; Bouleng. Faun. 
Ind., Rept. p. 400 (1890). 
Enhydris nigrocinctus, Merr. Tent. p. 140 (1820). 
Hydrus nigrocinctus, Bote, Isis, 1827, p. 553. 
Hydrophis nigrocinctus, part., Schleg. Phys. Serp. ii. p. 505 (1837) ; 
Dum. & Bibr. vii. p. 1550 (1854). 
Head small; anterior part of body slender, its diameter one 
third to two fifths the depth of the posterior part. Rostral broader 
than deep ; nasals shorter than the frontal, about twice as long as the 
suture between the prefrontals ; frontal longer than broad, as long 
as its distance from’the end of the snout, shorter than the parietals; 
one pre- and one or two postoculars; a small loreal sometimes 
present ; seven upper labials, third and fourth entering the eye, 
second and fourth largest ; two superposed anterior temporals ; two 
pairs of subequal chin-shields, posterior separated by scales. 27 or 
29 scales round the neck, 39 round the body; scales imbricate, 
rhombic, keeled. Ventrals distinct, but feebly enlarged, 310-331. 
Pale olive above, yellowish inferiorly, with black annuli, which are 
broader on the back. 
Total length 1000 millim.; tail 100. 
Bay of Bengal and Straits of Malacca. 
Q (V. 328). Sunderbunds, Bengal. Dr. P. Russell, College of 
a. 
Surgeons [E.]. (Type). 
b. 3 (V. 323). Bengal, Gen. Hardwicke | P.}. 
ec. 2 (V. 310). India. Gen. Hardwicke [P. ]. 
d. Hgr. (V. 310). Malay Archipelago. Dr. Bleeker. 
10. Hydrophis mamillaris. 
Russell, Ind. Serp. i. pl. xliv. (1795). 
Anguis mamillaris, Daud. Rept. vii. p. 340 (1803). 
Hydrophis fasciata (non Schn.), Giinth. Rept. Brit.- Ind. p. 374, 
pl. xxv. fig. Q (1864). 
mamillaris, Bouleng. Faun. Ind., Rept. p. 401 (1890). 
Head very small; anterior part of body very slender, its diameter 
about one third the depth of the posterior part. Rostral broader 
than deep ; frontal longer than broad, as long as its distance from 
