Total length, 450 millimetres; tail 53.
Habitat: East Africa.
(2) A. congica.—Five supralabials, of which the fourth is the larger; postocular in contact with a large temporal; one præocular; frontal as long as or slightly shorter than the parietals. Scales on the body in 19-21 rows; 209-230 ventrals; 19-23 subcaudals.
Fig. 42.—Skull of Atractaspis aterrima (African Viperine). (After G. A. Boulenger, op. cit.)
Colour uniform dark brown or black.
Total length, 450 millimetres; tail 35.
Habitat: Congo, Angola.
(3) A. irregularis.—Characters as before, but scales on the body in 25-27 rows; 220-257 ventrals, subcaudals 22-28 pairs.
Colour uniform black or dark brown.