Gastrimargus infumatus, Spix, Sim. et Vespert., Bras., p. 41, pl. 29 (1823).
Lagothrix poeppigii, Schinz, Synops. Mamm., i., p. 71 (1844); Pucher., Rev. et Mag de Zool., p. 299 (1857); Schl., Mus. Pays Bas, vii., p. 164 (1876).
Lagothrix geoffroyi, Schinz, Synops. Mamm., i., p. 72 (1844).
Lagothrix castelnaui, Is. Geoffr. et Deville, C.R., xxvii., p. 498 (1848); Casteln., Voy. Amér. Sud, Zool., p. 5, pl. 1.
Lagothrix infumatus, Gray, Cat. Monkeys Brit. Mus., p. 46 (1870); Scl., P. Z. S., 1871, p. 219 (Note).
Characters.—Large in size; face naked, black; general colour dark reddish-grey, the hairs being reddish-brown at the base, and tipped with grey or black; head, face and hind hands darker brown; chest, upper side of fore-arms, and under surface of body dark brown, or almost black; sides of body, base of the tail and perineal region brownish-red; hair of chest and under surface long and rather rigid.
Distribution.—The Brown Lagothrix, also called "Capparo" by Humboldt, is common in the forests of the low country over the whole of the Valley of the Peruvian Amazons. It has been recorded from the Valley of the Copataza river, and also from Macas, both in Cis-Andean Ecuador.
Habits.—These Monkeys go about in pairs, in troops of about twelve to fourteen, and frequent the great forest trees. They are often found in company with species of other genera, such as the Howlers. They are exclusively fruit-eaters, and are in great request as food; large numbers, consequently, are destroyed annually for this purpose.
THE WOOLLY SPIDER-MONKEYS. GENUS BRACHYTELES.
Brachyteles, Spix, Sim. et Vespert. Brazil, p. 36 (1823).