Cebus leucogenys, Gray, P. Z. S., 1865, p. 824, pl. xlv.; id. Cat. Monkeys Brit. Mus., p. 48 (1870).
Cebus frontatus, Schl., Mus. Pays Bas, vii., p. 206 (1876).
Characters.—Fur soft, elongate, silky, with thick under-fur. Hair on front of head elongate and reflexed, forming across the brow a short crest, higher above each eye; hair on top of head lying flat; that on cheeks short and adpressed; base of nose large, and corrugated longitudinally; toes long; tail longer than in other species; under surface of body less haired.
General colour silky brown, almost black on the head and limbs, paler on the shoulders and arms; the whiskers forming a white, or sometimes pale yellow, band, bordering the cheeks from opposite the eyes to the chin. Face and hands naked, violet; skin below the hair of the same colour.
The hair of the body is longer in winter than in spring; but the crests, or "horns," and the white whiskers appear only when the animal is fully adult.
Distribution.—Brazil.
III. THE SLENDER CAPUCHIN. CEBUS FLAVUS.
Cebus barbatus, Geoffr., Ann. Mus., xix., p. 110 (1812); Schl,. Mus. Pays Bas, vii., p. 197 (1876).
Cebus albus, Geoffr., t. c. p. 112 (albino).
Cebus flavus, Geoffr., Ann. Mus., xix., p. 112 (1812); Kuhl, Beitr. Zool., p. 33 (1820); d'Orbig., Voy. Amér. Mérid., iv., Mamm., p. 1, pl. 3 (1847); Schl., Mus. Pays Bas, vii., p. 204 (1876).