124 Mammals of Eastern Asia 
to Annam. Trachypitheciis francoisi occurs in Tonkin and 
Kwangsi; T. laotum in Laos; T. poliocephalus in northeast 
Tonkin; and T. delacouri in Annam. In the west of our area 
there is still another species, Trachypitheciis pileatus with sev- 
eral races, found in Assam, the Chindwin area, and north and 
south of the Brahmaputra River. 
The Bonneted Leaf Monkeys, Trachypitheciis pileatus, are 
colored gray above, contrasting whitish or buffy below, with a 
dark dense matted cap of hairs on the head. The face is black, 
the whiskers whitish. A race with reddish underparts, T. p. 
durga, is found in Chittagong, northern Assam, and the Naga 
Hills. In the Chindwin basin the form T. p. shortridgei lacks 
the sharp contrast between dorsal and ventral color. Its whiskers 
do not contrast with the crown. The tail is much longer than in 
other species of Trachypitheciis. 
The length of head and body in T. pileatus is from 23 to 28 
inches, of the tail from 35 to 41 inches, of the foot about 7% 
inches. In T. p. shortridgei the corresponding dimensions are 
26 to 28% inches, 38 to 41 inches, 7y 2 to 8 inches. 
Phayre's Leaf Monkeys, Trachypitheciis phayrei, found 
typically in Arakan, south of upper Burma, are blackish brown 
above, yellowish white below; these colors meet in sharp con- 
trast along the flanks. The hands, forearms, and feet are dark 
brown. The areas around the eyelids and mouth are not dark- 
pigmented. The form found in Siam, 7". p. wroughtoni, has the 
underparts pale gray instead of white. From the Shan States 
comes T. p. shanicus, which has a frontal hair whorl but no crest, 
and from northern Burma and southwest Yunnan Barbe's 
Langur, T. p. barbei, gray above, silvery beneath, with a buffy 
wash on the back and a fringe of long black hairs on the fore- 
head. 
The length of head and body in T. p. argenteus is from 19% 
to 23 inches, of the tail from 30 to 32 inches. 
