Habitat: From Senegambia and Upper Egypt to Angola and the Transvaal.
(5) N. anchietæ.—Scales in 17 rows on the neck and on the body; 181-192 ventrals; 52-62 subcaudals.
Colour blackish or brown above; end of snout and cheeks yellow; belly yellow or pale brown, with or without black cross-bar under the neck.
Total length, 1,800 millimetres; tail 340.
Habitat: Angola and Ovamboland.
(6) N. goldii.—Eyes large, two-thirds the length of the snout in adults. Scales in 15 rows on the neck and on the body; 194—195 ventrals; 88 subcaudals.
Colour black, uniform, or with transverse series of small whitish spots; cheeks and end of snout white, with a black border at the margin of the shields; belly white in front, black behind; subcaudal scales black.
Total length, 1,750 millimetres.
Habitat: Lower Niger.