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This genus exhibits the same characters as Callophis, except that the poison-glands, instead of being confined to the temporal region, extend a very long way on each side of the body, to about one-third of its length, gradually growing thicker and terminating at the base of the heart.

It includes four species:—

(1) D. bivirgatus.—Colour reddish-purple or black on the back, red on the head, tail, and belly.

Total length, 1,610 millimetres; tail 190.

Habitat: Burma, Indo-China, Malay Peninsula, Sumatra, Java, and Borneo.

(2) D. intestinalis.—Brown or black on the back, with darker or lighter longitudinal streaks; tail red beneath; belly red, crossed with black streaks.

Total length, 580 millimetres; tail 45.

Habitat: Burma, Malay Peninsula, Sumatra, Java, Borneo, Celebes.

(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.