432 DISEASES DUE TO VENOMS AND POISONS 



common cobra of North Africa; the N. llava of South Africa; 

 the N. milanolanta and N. nigrocolHs of Central Africa. 



The Sepedon is found only in Africa. The scales have a keel 

 or midrib. It grows to a large size. 



The Dentraspis is common. It lives in trees, and is 7 to 8 feet 

 long, but is not as thick as the cobra. 



Bitts arietafts (the puff-adder). (After Dumeril and Bibron.) 



The Elapechis is distributed over Africa south of the Sahara. 



It has a very short tail. Little is known of its venom. 

 (2) Viperince. 



The Vipera is widely distributed. 

 . The Bitis or puff-adder is common. It has a short thick body 

 and carries enormous poison fangs, often more than i inch in 

 length. Between the rostellum and nasal shield there are 

 numerous small scales. The "pocket" above the nasal 



