186 ALLEN’S NATURALISTS LIBRARY. 
Distribution. — Interior of Demerara, Kaicteur Falls; Rio Negro, 
and Rio Branco in Amazonia; Cayenne; Surinam. 
Il], THE BLACK SAKI. PITHECIA SATANAS, 
Saki noir, ¥. Cuv., Hist. Nat. Mammif., pl. 78. 
Simia satanas, Hoffm., Mag. Ges. Berl., x., p. 93 (1807) ; 
Humb., Obs. Zool., 1., p.-314, pl. xxvii. (1811). 
Pithecia satanas, Geoffr., Ann. Mus., xix., p. 115 (1812); Scl., 
BP. 2. So, 1864; p.. 712, DL. xii. 5 id, +4... p. 238 5 are 
Mus. Pays Bas, vii., p. 224 (1876). 
Chiropotes cuxio, Lesson, Sp. Mamm. Bimanes et Quadrum., 
p- 179 (1840). 
Chiropotes ater, Gray, Cat. Monkeys Brit. Mus., p. 61 (1870). 
Chiropotes satanas, Gray, t.c. p. 61. 
Characters.— Male.—Fur soft ; tail bushy and as long as the 
body ; crown with long black hair arranged on each side, 
divided by a central line. “The hair of the head sits on it 
like a cap, and looks as if it had been carefully brushed.” (Baées.) 
Long whiskers on each side, and the chin with a moderate 
beard. Fur black and shining ; back sometimes washed with 
grey or ashy-brown. 
Female.—Similar to the male, but having a browner back. 
Young.—Beard absent or rudimentary ; hair of crown radiating 
from centre and projecting forwards. 
The skull in this species is sometimes ossified into one 
piece. 
Distribution— Lower Amazonia; Para; British Guiana; the 
River Orinoco, towards the Rio Negro. 
Habits.—Little is known of the habits of the Black Saki, 
which is also known under the names of “ Cuxio ” and “‘ Mono 
