Total length, 520 millimetres; tail 50.
Habitat: Gaboon, Congo, Angola, Central Africa.
(2) E. niger.—Snout and arrangement of scales as before. Internasal shields three-fourths of the length of the præfrontals; frontal two-thirds of the length of the parietals.
Colour, black all over.
Total length, 420 millimetres; tail 30.
Habitat: Zanzibar.
(3) E. hessii.—Snout as in foregoing. Symphysial shield of the lower lip in contact with the anterior chin-shields.
Colour grey, with black cross-bars; a series of black spots on the sides, between the bars; large black blotch on nape; belly white.
Total length, 160 millimetres; tail 12.
Habitat: Congo.