^40 MR. R. LYDEKKER ON [DeC. 15, 



as well as external, I think it will be correct to distinguish this 

 Wart-Hog, presumably from Somaliland, by a separate name, 

 and I venture to propose to call it Phacochcerus delamerei. 



I hope that sportsmen who visit Somaliland may have their 

 attention drawn to this animal and bring home satisfactory 

 material to fully elucidate this question. 



As the Eurasian members of 8uidse are less speciaHzed than 

 the Afi'ican genera of the same family, it must be assumed that 

 the hogs originated on the Eurasian continent, the more so as 

 the oldest known fossil remains belonging to this famil}^ have 

 been found in Europe. The genera of Suidee less specialized than 

 the Wait-Hog, even Potamochcerus and Hylochoerus, have the 

 postorbital portion of the skull comparatively much longer and the 

 interorbital region much narrower than the corresponding parts 

 •of Phacochcerus. Thus a comparatively long postoi'bital and a 

 narrow interorbital region of the skull in a Wai-t-Hog indicate 

 a less specialized race. It agrees well both with the geographical 

 distribution . and origin that the most noithern races of 

 Phacochoerus, viz. Ph. celiani in Abyssinia and Ph. afr%canu& in 

 •Senegambia, are the least specialized. Ph. massaicus further 

 south has retained a rather long postorbital i-egion of the skull, 

 l)ut acquired a great interoi'bital breadth. The Wart- Hogs from 

 Lake Mweru and Nyassa, on the other hand, have still a narrow 

 forehead, but their postoi'bital j^ortion is somewhat shortened, 

 while Ph. sundevallii has the forehead broader but the postorbital 

 portion not so much shortened. Finally, in the Cape region, the 

 most specialized of all Wart-Hogs, Ph. o;thiopicus, with very short 

 postorbital portion and a comparatively broad forehead, is found. 

 It has also completely lost the U23per incisors, while the 

 lower ones are absent or rudimentary. Ph. clela'inerei, which at 

 present must be regarded as inhabiting Somaliland, has in 

 that country independently reached a similar stage of specializa- 

 tion as Ph. (xthiojncus at the Cape. It is probable that this 

 analogy between the Wart-Hogs of the Cape and Somaliland 

 depends upon similar natural conditions of the two countries, and 

 if that be so there might no doubt be found other instances of 

 parallel development within the same geographical areas. 



4. On Two Chinese Serow-Skulls, 

 By R. Lydekkee. 



[Received October 3, 1908.] 



(Text-figures 191-192.) 



When I described the immature specimen of the White-maned 

 Berow (^Neviorhcedus argyrochcetes) of Sze-chuen in the Society's 

 'Proceedings' for 1905, vol. ii, p. 329, pi. viii., some doubt was 

 expressed at the meeting as to whether the animal was anything 

 more than a local race of the widespread i\^e?norA(^(:?iJs sumatrensis; 



