72 MAMMALS OF THE PACIFIC WORLD 



Islands, and includes a number of forms, several of which are 

 probably only color phases. The group may be divided into two 

 subgroups, monkeys with blackish backs and monkeys with red- 

 dish backs. 



Typical melalopha is one of the reddish forms. The back is 

 red, slightly tinged with brown. The cheeks and forehead are 

 white, and there is a reddish fuscus band from the side of the 

 brow to the crest. The arms and legs are yellowish red, the 

 hands and feet whitish yellow. The underparts, the inside of 

 the limbs, and the basal half of the tail are white. This monkey 

 is found in the Sumatran mountains opposite Bencoolen south 

 to Mt. Dempo. In the mountains north of the range of melalo- 

 pha, another form of this red monkey is found (flavimana). 

 It differs from the preceding by having the forehead red instead 

 of white and the back red, mixed with black. About Indrapura 

 there is found a monkey (nohilis) with a deep red back and 

 with cheeks, underside, and inside of the limbs tinted pale red. 



At Mt. Ophir a race (sumatrana) is found with dark gray- 

 brown on the back and the upperside of the tail. The external 

 parts of the limbs are darker than those of typical melalopha, 

 and the hands and feet are black. The lower chest is dusky 

 gray; the chin, throat, belly, and the innersides of arms and 

 legs and basal three-fourths of the tail are white. On the Batu 

 Islands a smaller form (batuana) is very similar in color to 

 sumatrana. In the Siak district on the eastern side of Sumatra, 

 the leaf monkeys (percura) of this group have tails grizzled in- 

 stead of pure white. 



In the southern part of Sumatra a variable monkey of the 

 melalopha group (fusco-murina) is distinguished by the absence 

 of any red on the back, on the outerside of the limbs, or upper- 

 side of the tail. The back and outsides of the forelegs are brown- 

 ish gray and there is a dark stripe on the brow and sides of the 

 head. The top of the head is whitish. The naked skin on the 

 face, hands, and feet is white. A white animal with brownish 

 gray back, yet unnamed, is thought by some to be a color variety 



