Quadbumaka. MAMMALIA. Quadbumana. xv 
of hair which stands out from the forehead ; this 
divides, and presents an appearance of two liorn-like 
projections, which gives the specific name. These 
horns do not appear until maturity. The fur is mostly 
a deep brown or chestnut, with a tinge of red. The 
crest is grayish. 
WHITE-CHEEKED CEBDS {Oebus leucogenys) is 
blackish, with soft, elongate, silky hair, and a 
thick under-fur. The hair of the head is shorter, 
and that of the face is reflexed. The cheek and 
temples are whitish-yellow, giving rise to its specific 
name. 
THE APELLA {Oebus apella). — This is regarded as a 
very variable species. Its fur is thick, harsh, of a 
reddish-brown color, darker on the middle of the back, 
tail and legs. The fore-arms, whiskers and crown, 
black or blackish. The front of shoulders is paler, 
or yellow. The crown spot is broad, and often pro- 
duced into longitudinal crests, somewhat elongated. 
A variety has pale yellowish fur, with yellow whiskers. 
This is the Simla apella of Linnaeus, S. cornu of Buf- 
fon, and C. macrocephalus, or Big-headed Cebus of 
Spix. 
THE SLENDER CEBDS {Oebus pallidus) has the 
crowu patch on the back of the head small and black- 
ish or brown in color. A small, short crest is ob- 
servable in some on each side. 'I'he fur is soft, gray- 
ish fulvous ; the limbs and tail of a darker brown. 
The beard is golden-yellow. It is the G. gracilis of 
Spix. Inhabits Bolivia. Two other varieties are 
recorded, the C. barbatus, Geoff, and 0. flavus, Geoff 
— the latter the Simla flava of Schreb. An albino 
variety is named C. fulvus, by D’Orbigny, from 
Bolivia. 
THE TUFTED CEBUS (C'eJws czrrj/er).— The fur of 
this is short, close, black. The face, chin, cheeks, 
sides of forehead, and narrow band over the eyebrow, 
yellowish-white, with interspersed blackish hairs. 
'I’he hair of the head is reversed, sometimes erected 
into two long tufts that are directed backwards. 
THE THICK-FURRED CEBUS {Cebus vellerosm).— 
'I’he fur in this species is very thick, elongated, and 
is of a blackish-brown, with long, shining hairs. The 
top of the head, nape and whiskers, are black. 'I’he 
limbs and tail are blackish. 'I’he spot on the head 
is black and narrow, coming to a point in two erect 
pencils. Lord Stuart de Rothsay procured this in 
Brazil. It is said to differ from most Cebi in the 
front of the shoulders being like the back. 
THE MONK CEBUS {Cebus Ximthocephalus).—ln 
this species the hair is short, stiff, varied with black 
and yellow in color. 'I’he crown, temple, whiskers, chin, 
shoulders, haunches, arms, legs and tail, black. The 
back and sides are yellow, with more or less of black 
washing. Sides of neck, chest and front of shoulders, 
yellow. The hair of the crown is reflexed, and short. 
'I’he forehead and temples are whitish-yellow. Two 
varieties are mentioned. This is the 0. cuccula- 
tus of Spix. Its habitat is Paraguay and Rio 
Janeiro. 
WHITE-FRONTED CEBUS {Cebus albifrons).—A. 
pale reddish-brown, with back and outside of the 
limbs, redder. The face, forehead, throat, shoulders 
and chest, white. The tail has rather long hair. 
The hair on the crown is short. 
THE WHITE-THROATED {Cebus hypoleucus) 
is black, with the forehead, front of crown, neck and 
sides of the head, white ; shoulders and chest the 
same. The face is a pale-flesh color. This is the 
Sai a gorge blanche of Buffon, and Simla hypoleuca of 
Humboldt. It is one of the most common species 
that we see in the menageries. It inhabits Central 
America, Guiana, and Carracas. 
THE WHITE-HEADED CEBUS {Cebus leucocepha- 
lus) has fur of a dark reddish-brown, and obscurely 
punctulated. Head to the front edge of ears, white. 
'I’he crown has a short, narrow, central black streak. 
The feet are blackish. Habitat Columbia. A variety, 
C. versicolor, is mentioned. 
THE PALE CEBUS {Cebus flavesaens) has fur nearly 
uniformly pale-yellow fulvous. The cheeks, whiskers 
and hair under the throat, grayish. The crown, nape, 
and middle of the back are darker ; outside of the legs, 
redder. The hair of the top of the head and nape is 
elongated, and directed backwards. This is the C. 
unicolor of Spix. Inhabits Brazil. 
CRESTED CEBUS {Cebus robustus).—T\\Q fur of 
this species is bright red in color. The limbs and 
tail are blackish. The crown is black. Some varie- 
ties are noticed. Habitat Brazil. 
THE GRIZZLED SAPAJOU {Cebus annellatus) has 
brown fur, with reddish washings, especially on the 
thighs. The hairs have several pale rings. The hair 
of the crown is short, reflexed, forming a long, com- 
pressed, central longitudinal crest. Streaks on the 
side of neck, bent down on front of the shoulders, 
yellow. The belly is reddish. The crown, temple, 
whiskers, arms and legs, within and without, and the 
tail, black. The face has deep black hairs. The 
crown spot is broad, with a broad line to the fore- 
head, and another on each. side of the whiskers. No 
special locality is given. 
GOLDEN-HANDED SAPAJOU {Cebus chrysopus).— 
The face, throat, chest, and front of shoulders, pale 
gray-brown ; the back of head and eyebrows darker, 
and blackish. The fur is a pale sooty-brown, washed 
with golden. The outside of limbs is a golden fulvous. 
'I’he hair is soft. Spix’s C. unicolor is considered by 
some authors to be this species. Habitat Columbia. 
THE BONNET SAPAJOU {Cebus subcristatus).— Its 
fur is blackish-brown ; the outside of legs are yellow- 
ish washed. The sides of the face are pale ashy. 
The front of the shoulders and the upper arms, yellow- 
ish. The toes and fingers are elongate, and very 
slender. Hair of the crown is elongate, and divided by 
a central line, diverging to the eyebrows, and forming 
an erect transverse crest behind them. A variety has 
the frontal crest not so distinct, the toes being shorter. 
No special locality is given. 
THE CAPPED CEBUS {Cebus capillatus). — In this 
the hairs of the crown are elongate, diverging in all 
directions. The fur is elongate, of a brown color, 
slightly washed with yellow, especially on the thighs. 
'I’he sides of the forehead are grayer, 'i’he sides of the 
neck, and outsides of the shoulders and arms, fulvous. 
'I’he crown and nape are blackish. Habitat Brazil. 
