298 P IT H EC I A 



Nat., fasc. I, 1856, pp. 177, 178; Sclat., Proc. Zool. Soc. Lond., 



1871, p. 228; Schleg., Mus. Pays-Bas, Simiae, 1876, p. 224; 



von Pelz., Bras. Saugth., 1883, p. 116; Forbes, Handb. 



Primates, I, 1894, p. 187. 

 Simia sagulata Traill, Mem. Wern. Soc, III, 1821, p. 167. 

 Brachyurus israelita Spix, Simiar. et Vespert. Bras, 1823, p. 11, 



pi. VII; Wagn., Abhandl. Bay. Akad. Miinch., V, p. 433, 



(Part.). 

 Pithecia sagulata Less., Man. Mamm., 1827, p. 59. 

 Brachyurus chiropotes E. Geoff., Cours Hist Nat. Mamm., 1828, 



p. 26, lOme LcQcn. 

 Chiropotes israelita Reichenb., Vollstand. Naturg. Affen, 1862, p. 



73, fig. 183. 

 Chiropotes sagulata Reichenb., Vollstand. Naturg. Affen, 1862, p. 



14, figs. 184-186; Gray, Cat. Monkeys, Lemurs and Fruit- 

 eating Bats, Brit. Mus., 1870, p. 60. 



RED-BACKED SAKI. 



Type locality. Banks of the Orinoco, Brazil. 



Geogr. Distr. British Guiana; region of the upper Orinoco, and 

 that of the Rio Negro and Rio Branco, Brazil. Peru, (Tschudi) ; 

 banks of the River Japura, Peru, (Spix) ; CararauQu, banks of the 

 Rio Branco, (von Pelzeln) ; Andros, (von Pelzeln). 



Genl. Char. Larger than P. satanas, beard long; hair of head 

 dividing in middle on adults, radiating from a point near the occiput in 

 young. 



Color. Top and back of head, lips, chin and whiskers black; 

 shoulders and upper parts of body golden brown, paler, more yellowish 

 brown in immature individuals; arms to elbows chestnut; forearms, 

 legs and tail black tinged with chestnut, the bases of the hairs being 

 that color ; hands and feet cinnamon rufous ; flanks like back ; middle of 

 abdomen blackish brown. 



Measurements. Total length, 780; tail, 370; foot, 124; ear, 32, 

 (Collector). Skull: occipito-nasal length, 76.1; Hensel, 59.1; zygo- 

 matic width, 60.7 ; width of braincase, 50.6 ; palatal length, 27.4 ; median 

 length of nasals, 14.1 ; length of upper molar series, 18.1 ; length of 

 mandible, 54.5 ; length of lower molar series, 22.5. Ex specimen in 

 British Museum. 



Spix's type of Brachyurus israelita is in the Munich Museum and 

 is certainly the same as this species ; there is no difference observable 

 whatever. 



