_Callithrix nigrifrons_, Spix, Sim. et Vespert. Bras., p. 21, pl. 15
(1823); Gray, Cat. Monkeys Brit. Mus., p. 56 (1870); Schl., Mus. Pays
Bas, vii., p. 232 (1876).
CHARACTERS.--Nearly allied to the Masked Titi (_C. personata_), but
distinguished by the nearly white back of the head and nape of the neck,
and by the hairs at the base of the tail being entirely red.
DISTRIBUTION.--Upper Amazonia.