_Cercopithecus pyrrhonotus_, Hempr. et Ehrenb., Symb. Phys., pl. x.
(1838); Geoffr., Dict. Hist. Nat., iii., p. 307 (1849); Wagner, in
Schreber's Säugeth., v., p. 42 (1855); Sclater, P. Z. S., 1871, p. 623;
1893, p. 250; Schl., Mus. Pays-Bas, vii., p. 84 (1876).
{65}_Cercopithecus ruber_, Rüpp., Neue Wirb. Säugeth., p. 8 (1835);
Martin, Mammif. An., p. 509 (1841) (in part).
_Le Nisnas_, F. Cuvier, Hist. Nat. Mamm., i., pl. 27 (1830).
_Chlorocebus ruber_, Gray, Cat. Monkeys Brit. Mus., p. 25 (1870).
CHARACTERS.--Of the same size as _C. patas_, and very similar to it. Fur
above, and on the lower part of the limbs rufous, and on the lower part of
the back, and under side of the tail, much darker rufous than elsewhere;
nose white, not black as in the preceding species; shoulders and external
aspect of arms rufous like the rest of the body, and not grey as in _C.
patas_.
DISTRIBUTION.--North-east Africa: Kordofan and Darfur, to a height of 3,000
feet above the sea. A specimen living in the Zoological Gardens in 1882 was
stated to have come from Somali-land.
Allied to the Patas and the Nisnas is Peters' Guenon (_Cercopithecus
ochraceus_, Peters, Reis. Mossamb. Säugeth., p. 2, pl. 1a), from Querimba,
Mozambique, which has the upper side yellowish, and is probably but a
variety of _C. pyrrhonotus_.