802 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol, XtV . 



very sharply defined, but on buttocks and thighs they lose their distinctness, 

 at the same time increasing in length. Tail dark drab above, almost black 

 on proximal half, pale drab below. Under parts and inner surface of limbs 

 scantily clothed with pale drab hairs of very silky texture, those bordering 

 mouth distinctly darker than elsewhere. 



Skull and Teeth. — The skull and teeth so closely resemble those of Macacus 

 " cynomolgus" that I can detect no tangible differences. 



Measurements. — For external measurements see table below. 



Cranial measurements of type : Greatest length (exclusive of incisors), 

 134 mm. ; basal length, 102 ; basilar length, 96; least palatal length, 57; 

 palatal breadth (between front molars), 25 ; zygomatic breadth, 90 ; mastoid 

 breadth, 71 ; greatest breadth of braiacase above roots of zygomata, 61 ; least 

 breadth of braincase immediately behind orbits, 39 ; orbital breadth, 67 ; least 

 distance from orbit to alveolus of inner incisor, 49 ; greatest depth of brain- 

 case (exclusive of sagittal crest), 50 ; mandible, 97 ; greatest depth of ramus, 

 19*6 ; maxillary toothrow (exclusive of incisors), 44 6 ; mandibular tooth- 

 row (exclusive of incisors), 50 ; crown of middle upper molar, 8*8 by 9 ; 

 crown of middle lower molar, 8-2 by 7"4. 



Specimens examined. — Eight, from the following islands of the Nicobar 

 group : Great Nicobar, 4 ; Little Nicobar, 2 ; Katchal, 2. 



Remarhs. — The series of eight specimens includes individuals of all ages 

 from half-grown young to aged adults. Throughout the colour is very 

 constant, and no approach is shown to the tawny of Macacus " cynomolgus." 



This monkey was supposed by Zelebor to be the same as Macacus carho- 

 narius, an animal from Sumatra, described by F. Cuvier in the Histoire 

 Naturelle des Mammiferes.^ That such is not the case is clearly proved by 

 Cuvier's description and figure, both of which refer to an individual of the 

 tawny ' cynomolgus ' type. 



Macacus umbrosus has long been known as an inhabitant of the Nicobar 

 Islands. It was recorded by Blyth as long ago as 1846. Blanford suggested 

 that it might have been introduced," but the reasons for this supposition 

 are not given. 



Measurements of eight specimens of Macacus umhrosus. 



2 Fanna of British India, I, Mamm., p. 22, 1888. 



