SPECIES OF MAMMALS OF THE PACIFIC AREA 73 



of the foregoing. It is found in the highlands of Palembang. 



The Mentawi Leaf Monkey (Preshytis potenziani) is black 

 with some white on the head. It is restricted to the Mentawi 

 Islands off western Sumatra. 



The fourth group contains only the species thomasi from 

 northeastern Sumatra. It is dark smoky gray on the back. The 

 upperside of tail, the outersides of limbs, feet, and hands are 

 black; the forehead is white with median and lateral black 

 stripes ; the innersides of the limbs and underparts are white. 

 This animal differs from the members of the melalopha group 

 in having the short hairs of the cheeks growing forward to form 

 a curved crest between the eye and the ear. There is also a 

 pointed medial crest. It lacks the frontal whorl and the definite 

 brow fringe. 



On the island of Java, the gray leaf monkey, Freshytis 

 aygula, is found. This animal is dark ashy gray, darker on the 

 loins, with the head, cheeks, and upper basal part of the tail 

 black. The outsides of the limbs are similar in color to the back 

 but there is generally some white on the hands and feet, and the 

 underparts are white. On Mt. Slamat, Java, a closely related 

 form (fredericce) occurs. With the exception of some white on 

 the throat and underparts it is entirely black. 



Hose's Leaf Monkey (Freshytis hosei) of north central Bor- 

 neo lacks the frontal whorl, the hairs sweeping backward to 

 form a crest less pronounced than that of thomasi of Sumatra. 

 The back and sides, tail and outsides of the limbs are ashy 

 gray. The hands and feet are black. The underparts are 

 white. The underside of the tail is little darker than the upper- 

 side. This monkey differs from all of the preceding by the fact 

 that the head markings of the sexes differ. In the male the fore- 

 head is wholly covered with a white band which joins the white 

 of the temples and cheeks and then passes over the ear to the 

 sides of the neck, thus leaving but a narrow band of blackish 

 gray along the nape to connect the colored crown and shoulders. 

 The female, in most cases, has the white on the head, cheeks, 



