SPECIES OF MAMMALS OF THE PACIFIC AREA 75 



uniform golden red; those of all preceding leaf monkeys are 

 white, generally with a black dorsal band and sometimes with 

 hands, feet, legs, and shoulders black. The western Javan form 

 (sondaicus) is a blacker animal, with a few gray-tipped hairs 

 restricted to the back of the thighs. One subspecies (kohlbrug- 

 gei) is confined to the island of Bali. It is similar in color to the 

 Javan form of pyrrhus, but it is slightly smaller. In Sumatra, 

 Borneo, and some of the neighboring small islands another 

 form (cristata) is distinguished by grayer hair tips and paler 

 ground color. P. p. ultima of Sumatra and Borneo is a still 

 paler form. On the South Natuna Islands vigilans occurs. Al- 

 though similar to cristata in outward appearance, it is charac- 

 terized by skull differences. 



The Proboscis Monkey (Nasalis larvatus) is confined to 

 Borneo. Its color is reddish or yellowish brown above, with 

 yellowish gray on rump, tail, and limbs. The undersurface is 

 yellowish white. In old males the tail is often white. The most 

 striking characteristic of this large monkey is its nose, which 

 in old males is much enlarged and movable. Proboscis monkeys, 

 traveling in small troops, prefer branches over water and are 

 frequently seen in Nipa palm swamps near riverbanks. Those 

 animals from northeast Borneo {orient alis) are paler than the 

 typical ones from west Borneo. 



The Pig-tailed Langur (Simias concolor), a large langur 

 with a short tail, occurs on the Mentawi Islands, off the south- 

 western coast of Sumatra. This monkey appears blackish 

 brown, although the individual hairs, especially about the shoul- 

 ders, are ringed with buff. It can be recognized by its short 

 (less than six-inch), nearly naked tail and its short, upturned 

 nose. The typical race was first discovered on South Pagi 

 Island. On Siberut Island a darker race (siberu) has been dis- 

 tinguished, of which a creamy buff phase has been recorded. 



