MACACUS. 81 



occiput has a sooty tinge, but on the frontal region it is short and nearly black. 

 The general tint of the trunk is sooty black ; but it pales on the lower side of the 

 neck, on the rump, and on the under parts of the body and on the inside of the 

 limbs, passing almost into gray on the inner side of the antibrachium and interior 

 femoral region and back of the thighs. Hair sparse on the groins and j)ubic region 

 and external to the callosities, this semi-nude area even, extending on to the base of 

 the thighs. The tail is very short and rudimentary, and frequently more or less 

 twisted, black and almost nude, but slightly upwardly curved, and about the same 

 length as in 31. arctoides. 



In the young state the animal is less black than in the adult. 



Length of body from muzzle to root of tail 21 inches ; length of tail 1 inch. 



Inhabits Borneo.^ 



The skull of M. maurus is at once distinguished from the skulls of the preced- 

 ing 3Iacaques by the flattening of the outer surface of the exterior margin of the 

 orbits, which is nearly vertical instead of being outwardly rounded, and the external 

 margins are high. This confers a narrow, elongated character to the face of the 

 animal, very characteristic of the species. Moreover, the malar portion of the 

 zygomatic arch is thrown forwards much more than in M. arctoides. The 

 region above the orbits is flat, and may either be concave or convex, depending 

 on difference of age. The nasal region is broad, vrith short, rather abruptly 

 expanded nasals. Dr. Murie has described the osteological features of this species 

 in detail. 



The Aru Islands are inhabited by a monkey which, if not identical with 

 31. numrus, is at least so closely allied to it that I hesitate to separate it. It is 

 distinguished from M. maurus, not by any difference in colouring, but by the 

 profuse character, great length, and density of its fur on its ventral aspect, which 

 is quite as dense and long as on the upper surface. A skull deposited in the British 

 Museum along with the skin presents certain differences from the skull of 3£. 

 maurus, and it is mature, and, apparently from the size of its canines, the 

 individual was a female. The muzzle is long and narrow and much thrown 

 forwards, and the orbits are more rounded and open than in 31. m.aurus, and the 

 nasal portion is more compressed and ridge-like, and the nasals are narrow and 

 elongated and markedly different from those of that species. The palate also is 

 very deep, and the base of the skull is broader than that of 31. maurus. 



Macactjs ocreatus, Ogilby. 



Papio ocreatus, Ogilby, Proc. Zool. Soc. 1840, p. 66 ; Ann. Nat. Hist. 1841, vol. vi. p. .517. 

 Macacus fusco-ater, Schinz, Syn. Mamm. vol. i. 1844, p. .58; Sclater, Proc. Zool. Soc. 1860, p. 420; 



Blyth, Journ. As. Soc. vol. xliv. 1875, ex. no. p. 7. 

 Inuiis [ImmsJ fiisco-aler, Wagner, Schreber, Saugetli. Suppl. vol. v. 1855, p. 59. 



TLis monkey is not unfrequently brought to Calcutta from Singapore, wbioh port it reaches in steamers from 

 Pontiana, on the west coast of Borneo. 



