G8 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



External form. — In general external form this species very closely 

 resembles Macacns nemestrinus, differing only in its slightly longer, 

 less robust arms and legs, and relatively smaller, more rounded head. 

 The hands and feet appear to be broader. The tail is proportioned 

 almost exactly as in Macacns neinestrinus. 



Face. — The physiognomy of Simias concolor, as shown by photo- 

 graphs of a freshly killed individual (pi. xiv) is essentially like that 

 of Rhinopithecus roxellana. The elevated ridge above the nostrils is 

 less abrupt than in the Tibetan animal as figured by Milne-Edwards, 

 and the concavity extending from this ridge to the eyebrows is longer 

 and less deep. Otherwise there is a very close .agreement between 

 the two species. 



Callosities. — The callosities are very large and conspicuous, even 

 more so than in Macacns nemestrinus. In the male they are joined 

 solidly together along the median line, but in the female they are 

 separated by a narrow strip of softer skin. 



Fur. — The fur is of the same length as that of Macacns ncmes- 

 trimis, except that the underparts are thickly haired from chin to 

 hypogastric region. The latter, together with the axillje and inner 

 side of upper arm are nearly bare. On head the hair spreads uni- 

 formly from forehead, that of middle growing directly backwards, 

 that of sides standing out as distinct tufts over ears. On cheeks the 

 hairs grow upwards, meeting the ear tufts and continuing them 

 backward beneath ears. Slightly below middle of cheek the hair 

 abruptly changes direction and grows downward, forming a thin 

 tuft on each side of the chin. Like rest of under surface of body 

 the chin is closely furred except the space immediately about lips. 

 On shoulders and back of neck the hairs are slightly elongated, but 

 not enough to form a distinct cape. 



Color. — Type : general color throughout clove-brown somewhat 

 lightened by drabby reflections. On underparts, head, legs, lumbar 

 region, and terminal tuft of tail, the brown is unmixed with lighter 

 color, and on hands and feet it darkens almost to black. On neck, 

 shoulders, outer side of upperarm, and entire back to lumbar region, 

 most of the hairs have a buff annulation about 4 mm. in width near 

 tip. These annulations are most abundant on neck and shoulders, 

 where they are also paler than elsewhere, approaching a grayish 

 cream-buff. In this region they produce a distinct grizzled effect, 

 much like that of the same parts in Macacns nmbrosns and M. 

 fusciis. On sides of body they become less distinct than on back, 

 and the ground color at the same time changes to a rather dark 

 broccoli-brown. The naked portion of face and chin is bordered by 



