EINAR LÖNNBERG, THE GENTJS POTAMOCHCERUS. 25 



below, the whole fore-ncck is black, the ears are black. The 

 dorsal crest begins between the latter, and is anteriorly much 

 mixed with dirty whitish but already above the shoulders 

 the black is dominating and in the lateral parts of the crest 

 rufous buff bristles are seen. The back and sides are mixed 

 rufous and black. On the back the rufous dominates but 

 the black increases more and more on the flanks. The 

 shoulders, hams, legs and lower parts are wholly black. The 

 greater part of the tail is buffish grey with black terminal tuft. 



A skin in the collections of the Brit. Mus. Nat. Hist. 

 which according to the label most probably has come from 

 Zomba (H. H. Johnston), belongs to the P. chceropoiamns 

 group and represen ts no doubt P. ch. nyasce. The general 

 colour of its body is rich rufous becoming black on the lower 

 side. The dorsal crest is much mixed with w^hite especi- 

 ally anteriorly. The ears are black without any whitish. 

 The forehead is w^hitish and this colour runs forward mesi- 

 ally so that the broad black ring around the snout is broken 

 by this into two large black lateral patches on either side 

 of the upper jaw but connected on the lower side. The large 

 whiskers are white separating the black patch below the eye ^ 

 from the black colour of tlie lower neck and throat. The 

 shoulders, legs and feet are black. 



A young male from Zomba, Nyasa-land, is also rufous 

 red on the sides and has long bristles. The forehead is påle, 

 the ears black and the dorsal crest chiefly black. 



The colour of P. ch. Jiyasoe is thus decidedly of the same 

 pattern as in the typical P. cJiosropoianius, although more 

 mixed with rufous on the back and sides, especially in 

 younger specimens. 



The chief difference is, however, found in the dimen- 

 sions of the skull, especially the narrow parietal flat area 

 which, although striking enough, hardl}^ may be admitted 

 more than subspecific value. Other dimensions are recorded 

 in the table of measurements (II). The forehead and the 

 greater part of the nasals are flat, and only anteriorly the 

 latter are somewhat convex so that they rise above the 

 naso-premaxillary suture. The nasals are broadest just in 

 front of the preraaxillary suture viz. about 51 mm., from 



^ This is also separated from the eye by a white band. 



