THE PRINCIPAL SPECIES OF POISONOUS SNAKES 43 
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. 
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) Æchis. 
The CROTALINÆ consist of only two genera :— 
(e) Ancistrodon. 
(f) Lachesis. 
1.—VIPE RIN AS. 
(a) Vipera. 
We shall not recapitulate here the characters of the Genus 
Vipera, which we described in dealing with the vipers of Europe. 
The genus is represented by several species, the geographical range 
of which is chiefly confined to Eastern and Central Asia. 
