KUNGL. SV. VET. AKADBMIENS HANDLINGAE. BAND 48. N:0 5. 133 



a somewhat younger sow is similar, the black patches at the eyes are less pronounced, 

 but on the other hand, a blackish band, grizzled with white, running between the anterior 

 corners of the eyes is more conspicuous than in the former. A well developed dorsal 

 crest runs from between the ears backwards along the neck, over the withers, and to the 

 middle of the back where it appears to cease abruptly. This crest consists of basally 

 black bristles with long white tips which are dominant in the older, but are shorter 

 in the younger so that the black of the crest in that specimen is seen everywhere 

 among the white tips. On the sacral region again, in front of the root of the tail 

 long black bristles with whilte tips form a bit of a crest. In this sacral crest there 

 are very few white tips to the bristles in the old specimen. In the younger their 

 number is greater, but they are not by far as numerous as above the withers. 

 The sides of the back are rich rufous, much mixed with black in the old, duller 

 rufous and with the black dominant in the younger sow. Sides of neck, chest, shoul- 

 ders, hams, feet, and lower side shiny black in both specimens. Tuft of tail black. 



The general colouration of these animals, and the length of the bristles indicate 

 that they belong to the P. choeropotamus group. But the nearly complete absence 

 of black or dark on the forehead as well as on and around the snout, the white chin, 

 and the abrupted dorsal crest appear to make this race quite distinct from the 

 hitherto described forms.^ In some respects it approaches to P. intermedins from 

 Uganda. In P. ch. nyasce, and johnstoni the snout is more or less completely black 

 above and below, and in other races there is a broad black ring around the snout, 

 and the chin is black, even if the greater part of the face is pale. 



These distinguishing characteristics are supported by others derived from the 

 skuU. The dimensions of the two skulls from Nairobi are recorded in the table of 

 measurements below. It may be seen from this that the measurements of the boar(?) 

 skull (conf. PI. X) nearly agree with the corresponding measurements of the skull 

 of an adult boar of Bush Pig from Kenia kept in British Museum Nat. Hist, where 

 it bears the N:o 4, 11, 5, 17. The measurements of this latter skull have been re- 

 corded in my previous paper on the genus Potamochcerus.^ In the boar skull of this 

 collection the width of the parietal flat area is 8,3 "/o of the upper mesial length of 

 the skull, and the same percentage for the specimen in British Museum Nat. Hist, 

 is 8,6 %. The present female skull has this area somewhat broader, but such a 

 discrepancy between the skulls of different sexes is found among other races as well. 

 By this relative dimension of the parietal flat area the boar skulls of this race are 

 very easily distinguished not only from the small and very narrow-headed Kilimanjaro 

 race, P. ch. doemonis, and the hkewise narrow-headed P. ch. nyasce,hut at the same 

 time also from the large- and broad-headed P. ch. johnstoni. The southernmost 



1 Conf. LOnnberg: Contributions to the knowledge of the genus Potamochoerus. Ark. f. Zool., Bd. 7, 

 N:o 6, Uppsala & Stockholm 1910. 



2 Ark f Zool Bd 7 N:o 6, Stockholm 1910, p. 16 & 17. As I have not been able to read the 

 proofs of this paper ''sufficiently because it was printed during my absence, tiiere are unfortunately several 

 misprints. Among other things it ought to be corrected that the type of P. ch. dcemoms, of course, is the 

 specimen of Brit. Mus. not that of Berlin. 



