Macacus maurus, F. Cuvier, Mamm., pl. xlv. (Avril, 1823); Anderson, Zool. Exped. Yun-nan, p. 80 (1878, pt.; with full synonymy); Schl., Mus. Pays-Bas, vii., p. 117 (1876).
Cynocephalus niger (?), Quoy et Gaim., Voy. de l'Astrol., Zool, i., p. 67 (1830).
Macacus arctoides, Is. Geoffr., Zool. Bélang. Voy., p. 61 (1834); id., Arch. Mus., ii., p. 573.
Macacus ocreatus, Ogilby, P. Z. S., 1840, p. 56; Sclater, in Wolf, Zool. Sketches, ii., pl. i. (1865); id., P. Z. S., 1860, p. 420, pl. lxxxii.; Anderson, t.c., p. 81 (pt).
Macacus fusco-ater, Schinz, Syn. Mamm. i., p. 58 (1844).
Macacus inornatus, Gray, P. Z. S., 1866, p. 202, pl. xix.; id., Cat. Monkeys Brit. Mus., p. 129 (1870).
Characters.—Face narrow and elongated, nude, except for a few short hairs on the upper lip; nose flat; ears rather long, rounded, thinly haired; hair on one side of the head forming a somewhat large whisker; groin, region external to the callosities, and down the thighs thinly haired; tail very short, nude, curved upwards; frontal band, face, and ears black; callosities and the surrounding parts thinly-haired; region of the buttocks flesh-coloured; hairs on the upper lip black; whisker-tufts black, with greyish tips; rest of the head and body sooty-black; lower side of neck, rump, under surface of body, inside of limbs, fore-arms, legs, and back of thighs grey; tail, black. Length of body, 21 inches; of tail, 1 inch.
Young.—Greyish-black.
In the skull the outer surface of the outer margin of the orbits is flattened; the nasal bones are short and expanded.
This species is distinguished from M. arctoides and M. fuscatus, by the colour of the face being black, instead of bright red.