Mammals from Peru and Bolivia. 307) 
mately as figured by Spix in his C. macrocephalus*. Chest 
and throat yellow. 'Forearms and legs blackish ; fingers and 
toes white. 
From other evidence it is clear that Mr. Bridges did some 
collecting in South-eastern Peru, so that species described as 
from Bolivia—Bridges ” may in some cases, as in that of 
Ctenomys opimus nigriceps t, be really Peruvian in origin. 
Cebus flavescens cuscinus, subsp. n. 
Closely allied to C. flavescens, Gray, but with a large brown 
coronal patch. 
Fur of face much longer than in most Cedz, there being no 
peripheral short-haired portion. Hairs on forehead and 
cheeks smoothly directed backward, those on the crown upright 
or slightly reversed, though not forming any marked crest or 
horns. General colour of back pale brown, with a suffusion 
of rufous. Hach hair is pale slaty at base, with a dull pale 
red intermediate portion and a brown tip; posteriorly on the 
rump the rufous increases in depth and intensity, passing 
gradually on to the rich rufous of the hind limbs. Throat 
and chest whitish; belly (the hairs of which are reversed 
forwards) bright orange-rufous, continuous with the rufous 
legs. Hairs of forehead and cheeks pale glossy yellowish, 
the tips of the hairs browner. Square patch covering crow n 
(about 2 inches broad and rather more in length) dark chocolate- 
brown, the bases of the hairs pale brown. Lars well clothed 
with shining yellowish hairs. Fore limbs pale brown above, 
passing into rufous on the forearm and whitish on the 
fingers; their inner sides bright rufous to the wrists. Hind 
limbs rich rufous both on their outer and inner sides, the toes 
dull whitish. Tail bushy, the bases of the hairs proximally 
rufous, terminally white, the tips of the hairs inconspicuously 
brown. 
Altogether the colouring of the body and limbs is not unlike 
_ that of ‘the monkey figured by F. Cuvier as the “ Sajou a 
pieds dorés”’ f, although the head is so entirely different. 
Skull small and delicate. 
Dimensions of the ty pe (as taken by the collector in the 
flesh) :— 
Head and body 340 millim.; tail 890; hind foot 250; 
ear 30. 
* Sim. & Vesp. Bras. pl. i. (1823). 
t Thos. Ann. & Mag. Nat, Hist. (7) vi. p. 884 (1900). 
ek Ne Mamm. (fol.) iii, pl, Ixix. 
