(3) D. bilineatus.—Black on the back, with two white streaks along the whole length of the body. Snout white; belly striped with black and white bands. Tail orange, with two or three black rings or spots.
Total length, 710 millimetres; tail 45.
Habitat: Philippine Islands.
(4) D. philippinus.—Back with dark brown cross-bands, merging into black transverse ventral streaks, which are separated by yellow or red interspaces. Head brown, with small yellow spots.
Total length, 430 millimetres; tail 35.
Habitat: Philippine Islands.
II.—Family Viperidæ.
The Family Viperidæ is represented in Asia by a considerable number of snakes belonging to the two Subfamilies Viperinæ and Crotalinæ.
The Asiatic Viperinæ belong to the genera:—
(a) Vipera. (b) Pseudocerastes. (c) Cerastes. (d) Echis.