62 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



forward, while in M. nemcstrinus those in a band about 20 mm. wide 

 above the eyebrows grow backward, meeting the others in an indis- 

 tinct ridge. The hairs of the cheeks are all directed backward, to 

 and surrounding base of ears. There is thus no indication of the 

 conspicuous semicircle of antrorse hairs surrounding front of ear in 

 the larger species. 



Color. — Dorsal surface from forehead to base of tail clear bister, 

 darker than that of Ridgway, the drab underfur appearing irregu- 

 larly at surface when hair is disarranged. Sides of body and inner 

 surface of arms and legs isabella-color. Belly isabella-color, fading 

 to light fawn-color on chest and throat. Outer surface of arms light 

 russet, that of legs dark isabella-color except on thighs, which are 

 mostly covered by an extension of the brown area of back. A 

 similar but less extensive wash covers proximal half of upper arm. 

 Sides of neck grayish cream-buff in striking contrast with upper 

 surface. Cheeks and chin brown like that of back, but not quite 

 as dark. Hands and feet dusky brownish. Tail sprinkled with 

 isabella-colored hairs. " Callosities fleshy brown. Palms and soles 

 light fleshy brown. "^ 



Skull and teeth. — The skull (pi. xi, fig. 2 ; pi. xii, fig. 2 ; pi. xiii, 

 fig. I ) is very much smaller than that of a slightly younger female of 

 Macaciis nemestrimis (pi. xi, fig. i ; pi. xii, fig. i ; pi. xiii, fig. 2) 

 from Tapanuli Bay, Sumatra. In general form, however, the two do 

 not appreciably differ. The bony palate is concave laterally (when 

 viewed from below, but to a less degree than in the larger animal. 

 Its median line is nearly straight, and shows only a trace of the deep 

 longitudinal concavity so conspicuous in M. nemestrimis in region 

 between premolars. Audital bullae a little more swollen antero- 

 laterally than in M. nemestrimis, but this character may be purely 

 individual. Teeth as in Macacus nemestrimis but smaller through- 

 out. In the larger animal the last upper molar is provided with a 

 distinct fifth cusp on the outer posterior margin of the crown. 

 Scarcely a trace of this can be detected in Macacus pagensis. Simi- 

 larly the back lower molar has one less cusp than that of Macacus 

 nemestrimis. The missing cusp in this tooth appears to be the pos- 

 terior on inner side. Whether these differences are any more than 

 individual peculiarities it is impossible to tell. 



Measurements. — External measurements of type : total length, 

 580 (690) ;- head and body, 435 (480) ; tail vertebrae, 145 (210) ; 



' Collector's note on label. 



^ Measurements in parenthesis are those of a younger female of Macacus 

 nemestrimis from Tapanuli Bay, Sumatra (No. 114,502). 



