KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58. NIO 2- 103 



the same of Ph. ajricanus from Cape Verd (viz. 13,4 and 13, i). On the other hand the 

 latter skull is narrower across the orbits, so that the breadth of the interorbital space is 

 onl} r 30 % of the upper length of the skull, while in the present specimens it measures 

 from 31,c to 32,7 %. 



The Abyssinian Ph. celiani has a narrow parietal area (6 — 8 %) and is thus widely 

 different. 



Ph. ajricanus bujo Heller from Lado is a name, which unfortunately has been 

 established on so yimsufficient material as an immature skull only. It seems, however, 

 to bear a certain likeness to the present skulls as it probably belongs to a large race, and 

 also because it has the premaxillaries extending 57 mm. beyond the base of the tusks. 

 Presumably this measurement has been taken not from the teeth themselves, but from 

 the frontside of their osseous sheaths, and then this dimension is quite as large in these 

 skulls in Capt. ARRHENius'scollection. The value of this characteristic appears, however, 

 debatable as the same, like many other dimensions of Warthog skulls, is very variable. 

 To prove this may be mentioned tliat in a skull of an old Warthog boar shot by H. R. H. 

 Prince Wilhelm during his expedition to Brit. E. Africa this dimension is 46 mm. but 

 in another, somewhat younger, from the same source it is 57 mm. With our present know- 

 ledge it is thus impossible to say, whether these Warthogs from the neighbourhood of 

 Rutshuru are identical with the Lado race, or not, but it does not appear very probable. 



From Ketekma, Bagirmi, E. Schwarz has described 1 a Warthog under the name 

 Ph. cethiopicus jossor. This one as well appears to be of a large race, although the author 

 quoted has not recorded those dimensions which are most useful for skulls of this kind 2 

 so that a comparison is made difficult. He compares, however, himself his new race 

 with ))Ph. a. celiani)) from Massaua, and says: »occiput shorter and broader», but just 

 by these features Ph. ajricanus ajricanus differs from Ph. a. celiani. It is thus possible 

 that the Bagirmi Warthog is very closely allied to Ph. a. ajricanus. In which relation 

 Ph. a. jossor and Ph. a. bufo stånd to each other is for the present impossible to tell. 

 From a geographical point of view a close relationship does not appear to be excluded. 3 

 From the same standpoint, on the other hand, there is not mucli likelihood that the Ba- 

 girmi and Rutshuru Warthogs should be identical, as the whole requatorial forest extends 

 between their habitats, but both are undoubtedly to count among the nearest relatives 

 of Ph. a. ajricanus and well defined from other races as celiani and massaicus. To avoid 

 confusion it seems the best way to distinguish mostly for geographical reasons the Wart- 

 hog from Rutshuru and the neighbourhood of Lake Albert Edward as Ph. a. centralis 

 until f urther and definite knowledge may be obtained about the range of variation of the 

 true Ph. ajricanus and Ph. a. jossor which as yet are imperfectly known. 



As already is mentioned above, and as also is to some extent expressed by the 

 table of measurements, the three old boar skulls now considered are somewhat different 



1 Ann. & Mag. Nat. Hist. (8), Vol. 11, 1913, p. 265. 



2 On the other hand lie has recorded the »length of upper tooth row » which is an extremely ehangeable di- 

 mension within the life time of the same individual. 



3 Since the above was written, I have had the pleasure of receiving a letter from Dr. Scitwarz, in which ho 

 says: »PKaeochoerm «. fossor ist, wie Sie selbst riclitig sägen, natiirlich am nächsten mit Ph. a. africanus verwandt 

 und unterseheidet sieh davon nnd von IIelleks bufo (dus wir hier [^Frankfurt a. M.] auch haben) durch das 

 iiberaus flaeh gestellte Jugale. » 



