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 milhmetres ; tail 35. 

 Habitat : Philippine Islands. 



II. — Family Viperid^. 



The Family Viperid^e is represented in Asia by a considerable 

 number of gnakes belonging to the two Subfamilies 'Viperin^ 

 and Ceotalin^. 



The Asiatic Viperin^ belong to the genera : — 



(a) Vipera. 



(b) Pseudocerastes. 



(c) Cerastes. 



(d) Echis. 



The Ceotalin^ consist of only two genera : — 



(e) Ancistrodon. 



(f) Lachesis. 



1.— VIPEEIN^. 

 (a) Yipera. 



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. 



