MACACUS. 53 



terior limbs is well clad with annulated fur like tlieir outsides; but their upper 

 halves internally and the belly are only sparsely clad with long brownish grey 

 unannulated hairs. The upper surface of the head is densely clad with short, dark, 

 radiating yellowish brown fur, broadly tipped with black, the hair radiating from 

 the vertex. On and around the ear the hair is very pale grey. Above the external 

 orbital angle and on the sides of the face the hair is dense and pale greyish, 

 but obscurely annulated with dusky brown and grey and directed backwards, and 

 similarly coloured hair is prolonged downwards on to the middle of the throat. These 

 hairs are rather long and dense, but they pass inwards as very short hairs below the 

 eye on to the hollow of the cheek, and in this region they are yellowish brown. The 

 face generally is sparsely clad with fine hairs, and with longer hairs on the 

 cheeks, with black hairs interspersed, and the upper and lower lips are simi- 

 larly clad; and the hairs on the chin are blackish, but there is no long beard; there 

 is a line of black, bristly, supraorbital hairs. The face is fleshy brownish on the 

 muzzle and between the eyes ; the circumorbital area and the forehead are almost 

 white, with a bluish tinge, the line of the eyebrows being brownish, and a narrow 

 line from the external angle of the eye outwards, reddish. 



The female differs from the male in the absence of the black on the head and 

 back, and in the hair of the under parts being brownish grey without annulations. 

 The shoulders are somewhat brighter than the rest of the fur, which is yellowish 

 olive ; this passes into greyish olive on the outside of the limbs, into dusky on the 

 upper surface of the hands and feet, and into black on the upper surface of the tail. 



Length of male, from muzzle to root of tail 23 inches ; length of tail without 

 hair 8 inches, with hair 10 inches. 



Inhabits the southern portion of Arracan and the valley of the Irawady. 



The Burmese pig-tailed monkey, M. leoninus, is intermediate between M. 

 rhesus and the pig-tailed Macaque, M. nemestrinus, which is its nearest ally. 

 These two pig-tailed monkeys constitute two well-mai-ked species, apparently 

 much more differentiated than the species more specially allied to M. rhesns 

 are from each other, so that there is no difficulty in seizing their particular 

 characters. 



The fully matured skull (figs. 1 and 2) is considerably smaller (see following 

 table, page 55) than that of M. nemestrinus. It differs from it in its very much less 

 forwardly projected muzzle, which has more of the characters of the downwardly 

 shelving muzzle of M. lasiotis, with little or no indication of an interorbital depres- 

 sion.; the slope from the supraorbital ridge to the extremities of the nasals and 

 premaxillae being in a nearly straight line downwards and forwards. 



It is altogether a much shorter, more globular, and more compact skull than 

 that of Macacus nemestrinus ; but, as in that species, the orbital ridges are very 

 strongly developed, and project considerably above and outside the orbits. The 

 upper margins are on a level with the vertex, so much so that there is a considerable 

 depression on the frontal region behind them. The orbits are ratber large, and the 

 interorbital portion of the skull is narrow. The muzzle is 'moderately developed, 



