154 HYVLOBATES 
Pegu and Arakan, to Tenasserim up to 3,500 feet, and the Malay 
Peninsula H. Lar has its range. In Siam H. LEucoceNnys and H. 
PILEATUS are found, the latter also going to Cochin China, through 
Cambodgia. 
In Tonkin at Lai-chee, near the Yunnan border H. HENRICI was 
procured, and H. nasutus, which is also a native of the Island of 
Hainan. In Annam H. GasrieLui has been obtained. In Sumatra we 
have H. acitis; and H. Leuciscus in Java. Borneo contains but one 
species remarkable for the wonderful variation in the color of its 
coat, H. concotor; and attributed to Sulu Island is a doubtfully 
separable form H. FUNEREUS: One very doubtful form from an 
unknown locality remains, H. Fuscus. 
KEY TO THE SPECIES. 
A. General color black. 
a: ‘Wolorentyely black;:.adt..te-eiequoys:- ec -oe H, nasutus. 
bx Krontal: bind white, evi. ts. sates gael. doe. cece H. hoolock. 
c. Eyebrows, whiskers, beard, hands and feet white ...... H. lar. 
d. Top of head, occiput and line down back of neck 
black; diac vi. eer hh eid arsine, go pea H. henrici. 
e. Area below ears, and throat beneath chin white. H. leucogenys. 
f. Area below ears, and throat beneath chin ochra- 
ceousmiinad:: Sian taclingesfion. cau.i.a Ee H. gabrielli. 
B. General\color uniform gray.vos.is. boas ¥..uitte is. tend FH. leuciscus. 
C. ‘General color buff oripaleshtown % . 1042 sedges ee Hi. agilis. 
D. General color buff and black or grayish and black..H. pileatus. 
E.’ General color brown and black :.. 0... .a:es054 aoe H. concolor. 
F,*«Genéral:color:gtayish white (.). so... ee sesw-aae he H. funereus. 
G. “General color shrigo brew 2) is)). Uo. cua). ac bial. aol H, fuscus. 
The above Key, excepting H. HEnric1, describes the typical style 
only of the recognized species, all of which are subject to variation, 
some of them to a most extraordinary degree, the black ones having 
albinistic individuals in many degrees of change and variety of tints; 
the paler forms on their side having melanistic representatives wholly 
or in part, so that a collection of members of this genus presents a 
bewildering array of many colored or unicolored individuals. 
These examples, adverse in the hues of their coats to the typical 
style, are not confined to particular localities, but are found, members 
of the same troop, and frequently in the same place in which the type 
