182 ALLEN’S NATURALIST’S LIBRARY. 
“Tn the lower part of the river you will find on the north the 
facchus | Hapale| bicolor, and the Brachyurus couxut | Pithecia 
satanas|, and on the south the red-whiskered Pithecia. Higher 
up you will find on the north the Azeles paniscus, ‘and on the 
south a black /acchus and the Lagothrix humboldtit.” 
THE SAKIS. GENUS. PITHECIA. 
Pithecta, Geoffr., Ann. Mus., xix., p. 115 (1812). 
Chiropotes, Gray, Cat. Monkeys Brit. Mus., p. 60 (1870), in 
part. 
The Sakis form the second section of the present Sub-family, 
and are characterised by their long, thick, and bushy non-pre- 
hensile tail. A thick beard conceals the large chin. Hair on 
the crown long, divided by a central line, and hanging over the 
head, half concealing the pleasing diminutive face, or con- 
fined to the head, cheeks, and chin. The ears are large. The 
upper and lower incisor teeth project forward, the upper inner 
pair being moderately large, the outer very small; canines 
strong and conical ; first pre-molar smaller than the others, and 
one-cusped; molars with square crowns, grooved in the middle 
and slightly four-cusped. | 
In the brain the whole of the cerebellum and the olfactory 
lobes are covered by the cerebrum. In general form the latter 
resembles that of the species of Cebus. The frontal and oc- 
cipital regions of the skull approximate in form to those in 
Man ; the angle of the mandible is expanded, but less so than 
among the Howlers (AZycetes). The ribs are relatively broader 
in this genus than in any other of the American Monkeys. 
I. THE HAIRY SAKI. PITHECIA MONACHUS. 
Simia monachus, Humb. and Bonpl., Obs. Zool., p. 359 (1811). 
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