_Cebus torquatus_, Hoffm., Mag. Ges. Nat. Freund. Berlin, x., p. 86
(1807).
_Simia lugens_, Humb., Obs. Zool., i., p. 319 (1811).
_Callithrix lugens_, Geoffr., Ann. Mus., xix., p. 113 (1812).
_Saguinus vidua_, Lesson, Species Mamm. Bimanes et Quadrum., p. 165
(1840).
_Callithrix torquatus_, Geoffr., t. c. p. 114; Gray, Cat. Monkeys Brit.
Mus., p. 55 (1870).
_Callithrix torquata_, Schleg., Mus. Pays Bas, vii., p. 235 (1876).
CHARACTERS.--Head round; face short; ears short, nearly naked; nose flat.
Fur soft and woolly, intermixed with many long, stiff, dark reddish-brown
hairs,--the hairs red at the base, and black at the tips; forehead black;
crown of head dark brown; a narrow band round the face, white; a narrow
collar round the neck, reddish-white; hands white; hair of feet red at the
base, but black at the tips. Length of the body, about 12 inches.
DISTRIBUTION.--Confined to the upper reaches of the Rio Negro, Brazil.
HABITS.--This species, often known under the name of the Widow Monkey, is
said to be very gentle in disposition. {160}When approaching to capture
insects or small birds, which form its prey, it becomes keen and excited,
but at other times it appears to be dull and listless. They roam about in
flocks of about half a dozen individuals, on the large branches of the
great forest trees. They are noisy animals, and in the early morning they
make the forest resound with their yelping cries.