EINAR LÖNNBERG, THE GENUS POTAMOCHCERUS. 23 



crest is for instance only 23,4 7o of the upper mesial length 

 of the skull while the corresponding percentage is at least 

 26 in the P. choeropotamus. In a similar way the percentage 

 expressing the least interorbital breadth is only 19,4 in the 

 former but from 20,9 to 22,3 in the latter. The length of 

 the last upper moiar is 37 mm. in P. ch. johnstoni or a little 

 larger than in P. choeropotamus. There are thus differen- 

 ces but hardly differences of specific value, and I think it 

 is most suitable to regard this Bush Pigto be only a geographic 

 subspecies of P choeropotamus. 



The skin belonging to this boar skull is mounted and 

 exhibited in the gallery of Brit. Museum ^ 



The first information about the outer appearance of 

 Johnston's Bush Pig may thus be obtained from this speci- 

 men. The head is greyish or dirty white, but the snout in 

 front of the warts is black all över with the exception of a 

 whitish patch on either side of the muzzle. There is a black 

 patch on the cheeks above the whiskers. The ears are black 

 except* at the base. The dorsal crest is black mixed with 

 whitish tips to the bristles; it begins almost on a level with 

 the ears. The back on either side of the dorsal crest is yel- 

 lowish brown darkening to brown and finally black on the 

 flanks. The legs, feet, and tail-tuft are black. 



From this description it is apparent that Johnston's Bush 

 Pig closely resembles P. choeropotamus. 



The type-locality of this races is as stated above Ngarawi 

 River, Nkanga, and låter has as an explanation been added 

 on the label »Deep Bay». The latter place is situated on 

 the western side of Lake Nyasa approximately about 10° 30' 

 S. lat. The boar which is described above and certainly be- 

 longs t© the same subspecies in consequence of the size and 

 shape of its skull (especially its parietal area, and large m^) 

 is from Fort Manning, which is situated much further south 

 about 13° 48' S. lat. It lies nevertheless within the area 

 from which the water flows from the west into Lake Nyasa. 

 With the present scanty knowledge it might only be guessed 

 that the western slope towards Lake Nyasa is the home of 

 the large, long-headed and broad-headed Potamochoerus choero- 

 potamus johnstoni (Major). 



^ But there wrongly labeled P. nyasoe, evidently in consequence of 

 its origin from Nyasa-land. 



