CHARACTERS.--Related to _C. samango_, but larger; hairs long above, olivaceous, speckled with black; head darker; a broad band covering the middle and lower back, and the base of the upper side of the tail rufous--the hairs ringed with black; arms, externally from the shoulders down to the hands, and internally on the lower part of the fore-arm, black; outer aspect of the thighs and legs blackish-grey, washed posteriorly with yellowish; tail, except at the very tip, deep black; the face, lips, {75}and ears naked, and black; a fulvous band across the forehead above the eyes; sides of the head fulvous, speckled with black; throat, creamy yellow; under side of body pale fulvous, the hairs ringed with black; the inside of the arms, thighs, and upper part of the legs greyish fulvous; feet black. Length of body, 28 inches; of tail, 26 inches. DISTRIBUTION.--British Central Africa. Procured from the natives of N-Konde, and brought from Karonga, at the north end of Lake Nyasa, by Dr. Moloney. HABITS.--Unknown. XXXI. SCHLEGEL'S GUENON. CERCOPITHECUS NEGLECTUS. _Cercopithecus leucocampyx_ (nec Fischer), Gray, Cat. Monkeys Brit. Mus., p. 22 (1870). _Cercopithecus neglectus_, Schlegel, Mus. Pays-Bas, vii., p. 70 (1876); Giglioli, Zool. Anz., x., p. 510 (1887); Scl., P. Z. S., 1893, p. 253. CHARACTERS.--General colour greyish-brown, finely grizzled; under side of body black; crown, outside of limbs and base of tail black; anterior aspect of thighs and a band across the haunches white. Distinguished from the true _C. leucampyx_ by the colour of the front of the thighs, and by its banded haunch. _Distribution._--The White Nile, where it was obtained by Consul Petherick. XXXII. THE DIADEM GUENON. CERCOPITHECUS LEUCAMPYX. _Simia leucampyx_, Fischer, Syn. Mamm., p. 20 (1829). {76}_Le Diane femelle_, F. Cuv., Hist. Nat., Mamm., livr. xlii. (June, 1824). _Cercopithecus diadematus_, Geoffr. in Bélang., Voy. Zool. p. 51 (1834). _Cercopithecus leucampyx_, Martin, Mamm. An., p. 529 (1841); Geoffr., Dict. Univ. Hist. Nat., iii., p. 304 (1849); Schl., Mus. Pays-Bas, vii., p. 83 (1876); Giglioli, Zool. Anz., x., p. 510 (1887); Sclater, P. Z. S., 1893, p. 253 ([female]). _Cercopithecus pluto_, Gray, P. Z. S., 1848, p. 56, pl. iii.; 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 23 (1870); Wagner in Schreb. Säugeth. Suppl., v., p. 48 (1855); Sclater, P. Z. S., 1870, p. 670, 1871, p. 36, 1892, p. 97.