€6 VENOMS 



long tooth at 1;he end of each ramus of the mandible. Head 

 narrow, elongate ; eye moderate, with round pupil ; nostril between 

 two shields. Body slightly compressed ; scales smooth, narrow, 

 very oblique, in 13 — 23 rows ; ventrals rounded. Tail long ; sub- 

 caudals in 2 rows. 



(1) D. viridis. — 211 — 225 ventral scales ; 107 — -119 subcaudals. 

 Colour uniform olive-green. Shields on the head edged with 



l)lack ; lips yellow ; belly and tail yellow, with scales and shields 

 bordered with black. 



Total length, 1,830 millimetres ; tail 460. 



Habitat : West Africa, from the Senegal to the Niger ; St. 

 Thome Island. 



(2) Z). jamesonii. — Coloration as before. Scales in 15 — 19 rows 

 (19—21 on the neck); 210—235 ventrals; 99—121 subcaudals. 

 Tail sometimes black. 



Total length, 2,100 millimetres; tail 560. 



Habitat : West Africa, from the. Niger to Angola ; Central 

 Africa. 



(3) D. angusticeps (The Mamba). — 202 — 270 ventral scales; 

 ■99 — 121 subcaudals. 



Colour green, olive, or blackish, uniform ; belly yellowish or pale 

 green ; caudal scales and shields not bordered with black. 



Total length, 2,000 millimetres ; tail 430. 



Habitat : West Africa, south of the Congo ; Central Africa, 

 East Africa, Transvaal, Natal. 



(4) D. antinorii. — Scales in 21 — 23 rows ; 248 ventrals ; 117 

 subcaudals. Colour olive on the back, yellowish on the belly. 



Total length, 2,690 millimetres ; tail 545. 

 Habitat: Abyssinia. 



II. — ViPERIDiE. 



The African Viperidce all belong to the Subfamily Viperincs, of 

 which the following are the seven principal genera : — 



