_Cebus lunatus_ (Sajou cornu), male; F. Cuv., Hist. Nat. Mamm., pl. 70
(nec Kuhl).
_Cebus vellerosus_, Is. Geoffr., Cat. Méth. Primates, p. 44 (1851, pt.).
_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.