144 VENOMS 
AFRICA.—(contd.) 
FAMILIES SUB-FAMILIES GENERA GEOGRAPHICAL AREA 
{ West Africa, Gambia, Great 
Causus ... + Lakes, Congo, Angola, 
Transvaal. 
(Morocco, Algeria, Tunis, 
‘| Egypt, Mozambique. 
[ Zanzibar, Zambesia, the 
| 
Vipera 
Cape, Transvaal, Congo, 
the Gaboon, Benguella, 
Angola, Senegal, Nigeria. 
aa | Cerastes ....-- North Africa, the Sahara. 
V IPERIDE Viperinæ ... 2) (North Africa, Lake Chad, 
ECTS) oe a ae Bee Soudan, Egypt, Somali- 
land, Socotra. 
Bitis 
| 
| ( Tropical Africa, Dahomey, 
| Atheris Lagos, the Cameroons, 
( the Gaboon, Congo. 
Tropical and South Africa, 
| Congo, Angola, Lake 
J} Chad, the Gaboon, Da- 
| homey, Gold Coast, Zan- 
\ Atractaspis .. 
zibar, Somaliland, Natal, 
and the Cape. 
