230 . 
I. The head and sides of the face covered with abundance of ad- 
pressed hair, which is longer on the sides of the chin in front 
of the ears; the forehead with a bald central longitudinal 
streak. 
1. PirHECcIA CHRYSOCEPHALA. 
Pithecia chrysocephala, I. Geoffroy, Compt. Rendus, xxxi. 1850, 
p. 875; Cat. Mamm. p. 55; Arch.du Mus. v. p. 557. t. 29. 
P. leucocephala, Gray, Zool. Sulphur, p. 12. t. 2 (head). 
P. inusta, Spix, Bras. p. 15. t.10¢. 
Hab. Brazil? 
The character which Dr. Kuhl gives of the longitudinal line on the 
forehead and the short yellow hair on the head of his P. ochroce- 
phala, which he described from a species in the Temminckian Collec- 
tion, makes me think that species must be very nearly allied to P. 
chrysocephala; but it differs from it in the upper side of the tail 
and outer side of the limbs being chestnut: could this have arisen 
from the specimen having been in confinement ? 
Il. The head covered with hair directed forwards ; the face with 
distant hairs, rather divergent from the centre on the fore- 
head, and more abundant, forming a kind of moustache on each 
side of the nose in front of the eyes ; all more or less deciduous 
on the older specimens, which often have a bald face ; fore- 
head without any distinct naked central line. 
2. P. MONACHUS. 
P. monachus, Geoff. & Kuhl, Beitr. p. 45; from a very young 
specimen in a bad state. 
P. irrorata, Gray, Zool. Sulphur, p. 14. t. 3, adult. 
P. hirsuta, Spix, Bras. p. 14. t. 9. 
Black : hair elongate, with elongated white tips ; hair of the head 
rather elongated. 
Adult.—Face nearly bald, /. ¢. t. 3. 
Young.—Face hairy, black, with white moustache in front of the 
eyes and side of the chin. 
Hab. Rio Negro. 
3. P. RUFIVENTRIS. 
P. rufiventer, Geoff. l. e. 
P. pogonia, Gray, Ann. and Mag. N. H. 1842, p. 256; Zool. 
Sulphur, p. 13.t. . 
P. capillamentosa, Spix, Bras. t. 11. 
Saki, Buffon. 
Black : the hair elongate, with a subterminal yellowish ring with 
a very short slender blackish tip beyond it ; hair of the head mode- 
rately elongated ; moustache bright yellow, very distinct, but formed 
of short adpressed hair ; chest and belly reddish ; face blackish. 
Hab. Brazil. 
