306 CACAJAO 



Brachyurus ouakary Spix, Sim. et Vespert. Bras., 1823, p. 12, pi. 

 VIII; Less., Spec. Mamm., 1840, p. 183. 



Cacajao melanocephalus Less., Spec. Mamm., 1840, p. 182. 



Ouakaria spixi Gray, Proc. Zool. Soc. Lond., 1849, p. 10, fig. 1. 



Brachyurus melanocephalus W. A. Forbes, Proc. Zool. Soc. Lond., 

 1880, p. 645, pi. LXIII ; H. O. Forbes, Handb. Primates, I, 

 1894, p. 175. 



Ouakaria melanocephala Gray, Cat. Monkeys, Lemurs and Fruit- 

 eating Bats, Brit. Mus., 1870, p. 62. 



BLACK-HEADED UAKARI. 



Type locality. Banks of the Cassiquiare River. 



Geogr. Distr. Forests through which the Rio Cassiquiare, Rio 

 Negro, and Rio Branco flow ; Brazil. 



Color. Face naked, and with the head, shoulders, limbs, hands, 

 feet and tail is black, except a portion of the upper side of tail which 

 is chestnut; back and sides reddish and black; rump and middle of 

 thighs reddish chestnut ; under parts blackish. 



Measurements. Skull : occipito-nasal length, 82 ; Hensel, 65 ; 

 zygomatic width, 61 ; intertemporal width, 40 ; median length of nasals, 

 12; length of upper molar series, 19; length of mandible, 55; length 

 of lower molar series, 21. 



I examined Spix's type of Brachyurus ouakary, Munich Museum, 

 and found it agreed with Humboldt's species. 



