IV. THE RED-BACKED SAKI. PITHECIA CHIROPOTES.
Simia chiropotes, Humb., Obs. Zool., i., p. 311 (1811).
Simia sagulata, Traill, Mem. Wern. Soc., iii., p. 167 (1821).
Brachyurus israelita, Spix, Bras., Sim. et Vespert., p. II, pl. 7 (1823).
Pithecia chiropotes, Geoffr., Ann. Mus., xix., p. 116 (1812); Scl., P. Z. S., 1871, p. 228; Schl., Mus. Pays Bas, vii., p. 223 (1876).
Brachyurus satanas, Gray, List Mamm. Brit. Mus., p. 13 (1843).
Chiropotes sagulata, Gray, Cat. Monkeys Brit. Mus., p. 60 (1870).
Characters.—Male.—Larger than P. satanas; black, with a reddish-chestnut patch on the back, with a coarse brownish beard, longer than in P. satanas; tail very thick, bushy.
Female.—Similar to the male, but without the beard.
Distribution.—Amazonia, Rio Negro, and Rio Branco; Upper Orinoco; British Guiana.