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. 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.
II. THE RED TITI. CALLITHRIX CUPREA.
Callithrix cuprea, Spix, Sim. et Vesper. Bras., p. 23, pl. 17, (1823); Gray, Cat. Monkeys Brit. Mus., p. 54 (1870); Schleg., Mus. Pays Bas, vii., p. 236 (1876); Thomas, P. Z. S., 1880, p. 394.
Callithrix discolor, Is. Geoffr., C.R., xxvii., p. 498 (1848); id. Cat. Méth. Primates, p. 41 (1851); id. Arch. Mus., v., p. 551, pl. 28; Wagner in Schreb., Säugeth. Suppl., v., p. 114 (1855).
(Plate XIV.)
Characters.—Fur soft and woolly, mixed with numerous long stiff hairs; face black; back grizzly blackish-grey in colour; tail the same but darker; the basal part and tips of the hairs grey, with an intermediate band below the tips, black; tip of the tail sometimes white; the cheeks, throat, hands, feet, legs, and the under side of the body, dark reddish bay; the ears coppery-red.