122 Mammals of Eastern Asia 
The Pigmy Slow Loris, Nycticebus c. pygmceus, occurring 
in southern Annam, Laos, and Cochin-China (Saigon), is 
called by Osgood a "very distinct species. It is small, and rather 
uniformly colored." 
THE OLD WORLD MONKEYS 
(SUBORDER cercopithecoidea) 
Excluding the Lemurs, Gibbons, and Apes, the Primates of 
the Old World are all referable to one or the other of two fami- 
lies, the Leaf Monkeys and Langurs, Family Colobidae, and 
the Macaques, Guenons, and Baboons, Family Cercopithecidae. 
Both these families have wide geographical distribution; both 
are present in Asia and in Africa. Their distinction is not always 
easy. The colobids are, in general, neatly patterned and bright- 
colored, long-tailed, short-faced, tree-living Monkeys, while 
the cercopithecids tend to have dull-hued pelage with areas of 
skin blue or red, shortened tails, and longish snouts, and some 
kinds at least affect rocky places either in the open or in forest. 
In addition, there are definite anatomical distinctions relating to 
dentition, limb proportions, the opposability of the great toe, 
and other structures. 
the leaf monkeys, langurs, pig-tailed langurs 
(family colobids) 
The Monkeys of this family typically have long, straight 
tails (there are exceptions), the hind legs longer than the fore- 
legs, the face and nose short (except Nasalis), and no cheek 
pouches (in Langurs). The large stomachs, divided into com- 
partments, are adapted to the digestion of their usual diet of 
leaves, young growing shoots, and fruits. The family is typified 
by the African genus Colobus, some species of which are re- 
splendency patterned in black and white. Four of the eight 
