174 
GEOGRAPHICAL ZOOLOGY. 
[part IV. 
development of the maxillary bones into strong lateral ridges 
corresponds to the structure of the most typical baboons. This 
species extends further east than any other quadrumanous 
animal. 
Family 4. — CEBIDiE. (10 Genera, 78 Species.) 
General Distribution. 
Neotropical 
Sub-regions. 
Nearutic 
Sub-regions. 
Palje arctic 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
Sub-regions. 
The Cebidse, which comprehend all the larger American 
Monkeys, differ from those of the Old World by having an 
additional molar tooth in each jaw, and a broad nasal septum ; 
while they have neither cheek-pouches nor ischial callosities, 
and the thumb is never completely opposable. Some have pre- 
hensile tails, especially adapting them for an arboreal life. They 
are divided into four sub-families, — Cebinse, Mycetinse, Pithe- 
ciina, and Nyctipithecinse. The Cebidrn are strictly confined to 
the forest regions of tropical America, from the southern part of 
Mexico to about the parallel of 30° South Latitude, The distri- 
bution of the genera is as follows : — 
Sub-family, Cebinse . — Cebus (18 sp.), is the largest genus of 
American monkeys, and ranges from Costa Rica to Paraguay. 
They are commonly called sapajous. Lagothrix (5 sp.), the 
woolly monkeys, are rather larger and less active than the pre- 
ceding ; they are confined to the forests of the Upper Amazon 
Yalley, and along the slopes of the Andes to Venezuela and 
Bolivia. Aides (14 sp.), the spider monkeys, have very long 
limbs and tail. They range over the whole area of the family, 
and occur on the west side of the Equatorial Andes and on the 
Pacific coast of Guatemala. Eriodes (3 sp.), are somewhat inter- 
mediate between the last two genera, and are confined to the 
eastern parts of Brazil south of the equator. The three last 
mentioned genera have very powerful prehensile tails, the end 
being bare beneath ; whereas the species of Cebus have the tail 
