68 



SIMIIDJE. 



antibrachium of whicli is gray. On the hinder quarters and outsides of the thighs 

 the terminal half of the hairs are wholly rufous -yellow, so that these portions 

 contrast forcibly with the former. In (^, the cheeks and supraorbital ridges are 

 surrounded with a fringe of long black hairs which are continued down to the 

 angle of the mouth, whereas in the other female there are only a few very short 

 black hairs in these situations. In both, the hairs half-way between the ear and 

 the angle of the mouth tend to form a whorl. The hair behind the ears and the 

 back part of the cheek are in /3 annulated in the former and yellowish in the 

 latter locality, but in « they are uniformly yellowish grey, and longer and more 

 wavy than in the former. In life, the face of /3 was seen to be more dusky * than 

 is generally the case in M. rhesus, while in « it was pale, as in this species, and peri- 

 odically flushed with crimson, which did not occur in /3. The hair on the top of the 

 head in both is directed backwards. In both, the under parts and insides of the 

 limbs are very pale yellowish white with a silky lustre. In « there is an extensive 

 area external to and below the callosities, which is only sparsely covered with very 

 short obscure white hairs, while in /3 the region below and around the callosities is 

 clad with lon«j rufous hairs. 



Measttbements. 



Length of body, along side 



of tail 



of fore-limb to tip of middle finger 

 of middle finger .... 



of foot 



of middle toe ... . 



Upper lip to eye 



Length of ear ..... 



Breadth between eyes .... 



Girth round muzzle, below the eyes 



„ „ head, over ears 



„ behind shoulder .... 



„ before thighs 



The above table shows that while the larger individual had a slightly shorter tail, 

 they agree in other respects, allowance being made for the greater age of «, and this 

 harmony prevails in the bones, the measurements of which follow. The only diifer- 

 ences of form observable in the skeleton of /3, as compared with «, are the greater 

 forward curvature of the proximal end of the humerus and more prominent cha- 

 racter of the deltoid ridge. But we are met with the fact that the skeleton of /3 has 

 13 ribs, its vertebral elements being — cervical 7, dorsal 13, lumbar 6, sacral 3, caudal 

 20 — forty-nine in all, while in « the normal number of ribs prevails with 6 lumbar 



1 Darwin records that Mr. Bartlett has observed that in all species of monkey known, in which the adults of 

 both sexes have strongly-coloured faces, the colours are dull and absent during early youth, and he remarks that 

 this likewise holds good of M. rhesus. This animal may, therefore, have been longer in reaching maturity than the 

 other, which seems probable from the circumstance that the occasional temporal flushing and enlargement of its 

 buttocks was very much less intense. Mr. Bartlett has also observed that the naked surfaces extend with age,— 

 jPescent of Man, vol. ii, pp. 310 and 377. 



