388 COLUBRID. 
to one half as long as its distance from the frontal; internasals as 
long as the prwfrontals, not reaching the preocular; frontal once 
and a half as long as broad, as long as its distance from the end of 
the snout, as long as the parietals ; one or two pre- and two post- 
oculars ; one, two, or three suboculars; temporals 142 or 3; seven 
upper labials, fourth or third and fourth entering the eye, sixth 
largest and in contact with the lower suboculars; four lower labials 
in contact with the anterior chin-shields, which are as long as or a 
little longer than the posterior. Scales in 15 rows on the neck as 
well as on the body. Ventrals 194-195; anal entire; subcaudals 88. 
Black above, uniform or with transverse series of small whitish 
spots; sides of head and end of snout white, with most of the 
sutures between the shields black; ventrals white, with a black 
edge, which becomes gradually broader until, on the posterior 
fourth of the body, the shields are entirely black; subcaudals 
black. 
Total length 1750 millim. 
Lower Niger. 
a. d (V. 195; C.?). Asaba. H. Crosse, Esq 
b. Yg. (V. 194; C.88). Mouths of the Niger. A. Bh, ape UP} 
10. Naia guentheri. (Pxiare XXI.) 
Pseudohaje nigra, Giinth. Cat. p. 222 (1858), nec Naia nigra, Smith. 
Eye large, about two thirds the length of the snout. Rostral 
broader than deep, the portion visible from above measuring one third 
its distance from the frontal; internasals as long as the prefrontals, 
not reaching the preocular; frontal once and one third as long as 
broad, as long as its distance from the end of the snout, two thirds 
the length of the parietals; one preeocular; three postoculars, one 
of which may be termed a subocular; seven upper labials, third and 
fourth entering the eye, sixth largest and in contact with the 
lower postoculars ; four lower labials in contact with the anterior 
chin-shields, which are as long as the posterior. Scales in 15 rows 
on the neck, in 13 rows on the body. Ventrals 185; anal entire ; 
subcaudals 74, Black above, brown beneath. 
Total length 2130 millim. ; tail 470. 
West Africa ? 
a. d (V. 185; C. 74). —-* Lord Derby [P.]. (Type.) 
233. SEPEDON. 
Sepedon, Merrem, Tent. Syst. Amph. p. 146 (1820); Wagler, Syst. 
Amph. p. 178 (1830) ; Gray, Cat. Sn. p. 32 (1849); Dum. §& Bibr. 
Erp. Gén, vii. p. 1258 (1854 
Naja, part., Schleg. Phys. Serp. ii. p- 461 (1837). 
Aspidelapa, part., Jan, Rev. § Mag. Zool, 1859, p. 510, 
