Midas leucogenys, Gray, P. Z. S., 1865, p. 735; id. Cat. Monkeys Brit. Mus., p. 67 (1870).

Hapale devillei, Schl., Mus. Pays Bas, vii., p. 262 (1876).

Hapale weddelii, Schl., t. c. p. 262.

Characters.—Fur of back ringed with grey; that of the head, neck, and front of the fore- and hind-limbs, tail, hands, and feet black; loins, thighs, legs, and base of tail bright maroon.

Distribution.—Obtained by MM. Castelnau and Deville, at Sarayacu, in the Peruvian Amazons.

VII. THE BLACK-FRONTED TAMARIN. MIDAS NIGRIFRONS.

Midas nigrifrons, Geoffr., Cat. Méth. Primates, p. 64 (1851).

Midas flavifrons, var. c. Midas nigrifrons, Gray, Cat. Monkeys Brit. Mus., p. 67 (1870).

Hapale nigrifrons, Schl., Mus. Pays Bas, vii., p. 263 (1876).

Characters.—Differs from M. weddelli in having the fur washed with rufous, and the hairs finely ringed.