8 EINAR LÖNNBERG, MAMMALS COLLECTED IN CENTRAL AFRICA 



or basal parts which give a brownish appearance, somewhat like burnt umber, when the 

 fur is parted. On the sides of the face there are about 8 '/, cm. long black whiskers, the 

 hairs of which are basally greyish. These whiskers are directed downwards and forwards. 

 The dense beard on the chin is about 5 7 2 cm., black but with a brownish tint to the 

 basal parts of the hairs. The lower neck is sparingly haired and the chest to great extent 

 naked. The arms are black with very long hairs, about 15 — 16 cm. near the shoulder, 

 about 14 cm. at the elbow, about 9 cm. on the back of the carpus then gradually diminish- 

 ing in length but still wery thick to the base of the fingers. The upper back is black, but 

 much grizzled by means of whitish tips and rings to the hair. Across the middle of the 

 back a broad belt of silky greyish white on which area the hair is short, rather thin and 

 adpressed. On the lower back the hair is somewhat longer again, but not more than 

 about 4 cm., black and grizzled with white tips. On the hams the fur is longer, about 

 8 V 2 cm., shaggier, black, grizzled with whitish tips, which latter appear to be more numer - 

 ous along the anterior part of the outer side of the tigh so that a light band is formed 

 there. The lower part of the leg is much less grizzled. The belly is black. 



The semiadult male (n:o 165) with the last molar not yet fully developed is 

 entirely black, without any grizzling and without the slightest trace of greyish white belt 

 across the back. This belt is thus a token of full maturity. The hair of the middle of the 

 back is about 5 7 2 cm., further down a little longer, at the elbow about 14 cm. 



The adult fe male is black with a slight brownish tint on the sides and lower 

 back in some shades of light. On the upper neck some hairs have påle rings without that 

 this influences the general colour. Around the ischiadic region and on the hams the fur 

 looks at closer inspection finely ticked with greyish brown, but this is produced by the 

 broken and partly split ends of the hairs, a result of wearing. There are no regular or 

 distinct ischiadic callosities, but in the place of such there is a bare patch on either side, 

 and the skin of these is, in counteraction to the rubbing and wearing, thickened and the 

 horny layer has a tendency of pealing of in flakes. It may be said to be ischiadic callosities 

 in being. In the old male there is no trace of such a bare place, but in the semiadult 

 male the hair is worn off on two symmetrically situated small spöts in the ischiadic region 

 corresponding to these patches in the female. The young male and female (n:o 40 & 39) 

 are also quite black, but as in the adult female the ischiadic region is finely ticked with 

 brownish by means of broken and split hairs. It is of interest to note that the male has 

 no worn ischiadic patch, but in the female there is a pair of such ones which are very 

 conspicuous, although not quite bare. 



The quite young animals (n:o 166 & 168) with milk-dentition and the first molar 

 developed are also black, but tending to »reddish black» (Dauthénay: Rep. de Coul. n:o 

 344, 1), or even »warm sepia» (1. c. n:o 305, 1) on the belly. Of very great interest is the 

 fact that both these inf ant Gorillas are provided with a small patch of white hair around 

 the anal opening, just like young Chimpanzees. This feature is thus of phylogenetic 

 importance. 



The length of the skin of the old male measures from the upper lip to the vent 132 

 cm.; the corresponding measurement for the adult female is 104 cm. The distance be- 

 tween the finger-tips of the old male when the skin is spred out is 237 cm. 



