938 DR. E. LONNBERG ON WART-HOG [DeC. 15, 



another from Lake Mweru (Is'o. 94.3.8,17, J ad.), are quite 

 similar inter se. Their interorbital width is respectively 28'8 % 

 and 29 "3 %, the length of their postorbital portion 12 ^/^ and 

 12"3 %, and the length of the postorbital flat area 11*1 °/^ 

 and 11*4 '^'/^ of the length of the skull. A third skull from Lake 

 Mweru (]S"o. 94.3.8,18, S jun.) is also similar with regard to the 

 first two dimensions, viz. 30 °/^ and 12 °/^^, but the postorbital flat 

 area is narrow, 8'7 %, in consequence of its youth. It appears 

 from this as if the Wart-Hogs of the country between Lake 

 Kyassa and Lake M\^-eru agreed in having a comparatively very 

 narrow interorbital region, narrower than in Ph. sundevallii. 

 The width of the flat postorbital portion is similar to that of 

 Ph. sihndevallii, but the length of the same is somewhat shorter. 



With regard to other measurements, it seems as if the skulls 

 from Angoniland, Nyassa, and Lake Mweru had a somewhat 

 longer preorbital portion (distance from tip of nasals to anterior 

 orbital margin) than both Ph. sundevallU and Ph. inassaicus. 



Com]3arative studies of more material of fully adult animals 

 may thus in the future prove that the Wart-Hogs inhabiting the 

 counti4es adjoining Lake Nyassa and Lake Mweru are racially 

 diflferent both from sundevallii. inhabiting Natal and probably 

 Transvaal and the southern pai-ts of Poi'tuguese East Africa, and 

 from Ph. massaicus, inhabiting the Masai country in German 

 East Africa. 



How widely Pft. oiiassaicus is distributed cannot be stated for 

 the present. The skull of a young Wart-Hog of male sex from 

 Uganda in the British Museum (No. 95.4.3.42) agrees so far with 

 Ph. viassaicits in having a very broad interorbital region, which 

 corresponds to 37 °/^ of the length of the skull. But, on the other 

 hand, the postorbital portion is rather small, its length being only 

 11 °/p and the width of its flat area only 10'5 ^/^ of the length of 

 the skull. If this smallness be not due to the youth of the 

 specimen, there must exist a separate race of Wart-Hog in 

 Uganda which should be easily recognized by the two combined 

 charactei'istics : great interorbital width and shortness of the 

 postorbital region. 



In the specimen examined the length of the jDOstorbital region 

 exceeds the width of its flat area by 2 millimetres only, but, 

 as experience proves that the latter dimension increases more 

 with age than the former, it is probable that in adult Wart-Hog 

 boars from Uganda the width of the postorbital flat area is 

 greater than the length of the same portion of the skull (as also 

 is the case in Ph. massaicus). 



In the collections of the British Museum are two Wart- 

 Hog skulls, numbered 0.3.27.16 and 0.3.27.17, wdiich aroused 

 the interest of the present writer more than all the others. 

 Both these, which were presented by Loi-d Delamere, have no 

 traces of upper incisors, and 0.3.27.16 has no incisors in the 

 lower jaw either, with the exception of two small pea-shaped 

 i-udiments lying in corresponding grooves of the jaw-bone ; these 



