102 



EINAR LONNBERG, MAMMALS COLLECTED IN CENTRAL AFRICA. 



lower edge of the otherwise hairy lip, a condition which is to be found very typically in 

 the Elk, but in various degrees also in other Ruminants. Finally, if before the closing 

 of the cleft in the lip, the mucous tissue has grown out over the anterior edges to such 

 a degree that a considerable portion of the same has been left outside the line of con- 

 crescence, a large bare and moist muffle is formed, as in its fullest development it is found 

 in Bos, but also in many other Ruminants. 



Phacochcerus africanus centralis n. subsp. 



The material of Warthogs in the present collection consists of and old female kiUed 

 at Lake Albert Edward the 20th Dec. 1913, an old male probable from the same locality, 

 and two boar-skulls and a skull of a sow. 



The most striking feature of these Warthog skulls is their considerable size. In 

 this respect they are not superseded by any Phacochoerus skull examined by the present 

 author except by a skull of Ph. africanus from Cape Verd in Brit. Mus. Nat. Hist.^ With 

 regard to several details they display a certain individual variation which appears to 

 be a rather common occurrence among Warthogs, but in general appearance and in relative 

 dimensions they agree well enough as the measurements recorded below prove. Their 

 racial identity ought accordingly not to be subjected to any doubt. 



Four to six lower incisors are retained in all skulls, even in the oldest, and two upper. 



From the above measurements it may be found that the Warthog skulls of this 

 collection nearly agree with Ph. africanus with regard to length. The postorbital portion 

 of the skull is comparatively long varying from 11, i to 14,2 % of the upper length of the 

 skull. The breadth of the parietal flat area varies almost in a similar degree, or from 

 11,1 to 13,5 % of the upper length of the skull. These percentages are rather similar to 



1 Cf. LoNNBEEG, Proo. Zool. Soc. London, 1908, p. 936. 



2 Only last upper molar in use. 

 ' Two upper molars in use. 



