Total length, 560 millimetres; tail 35.
Habitat: West Africa, from the Gold Coast to the Congo; Central Africa.
(4) A. corpulenta.—Postocular shield in contact with a large temporal; second lower labial very large, fused with the chin-shields. Scales on the body in 23-27 rows; 178-193 ventrals; 23-27 subcaudals.
Colour uniform blackish-brown; tail sometimes white.
Total length, 345 millimetres; tail 33.
Habitat: West Africa, from Liberia to the Gaboon.
(5) A. rostrata.—Snout very prominent, cuneiform. Third lower labial very large; first lower labial in contact with its fellow, behind the symphysial. Scales on the body in 19-23 rows; ventrals 227-248.
Colour uniform dark brown, or blackish.
Total length, 600 millimetres; tail 37.
Habitat: East and Central Africa.