358 CATALOGUE OF UNGULATES 



Bed Biver-Hog. 



Typical locality West Africa. 



Compared with P. cheer opotcmius, the coat is shorter and 

 denser, so that no portion of the skin is visible ; dorsal crest 

 short, white, and conspicuous, commencing, as a rule, a little 

 behind the ears ; general colour typically reddish brown or 

 rufous, but in adults the upper portion of the forehead, 

 between the eyes and ears, black, whitish in one race ; ears 

 black with more or less of the upper portion of the margins 

 of part of the tufts whitish ; in immature individuals the 

 forehead, except for the admixture of black hairs, coloured 

 like body ; facial tuberosities generally much less developed 

 tlian in typical species, the upper pair not projecting above 

 nasal plane (fig. 53). 



The range extends from the Gabun, Cameruns, and 

 adjacent districts to the Belgian Congo. 



The following is a tentative "key " to the local races : — 



A. Facial tuberosities of skull, when known, not 



projecting above nasal plane. 

 a. Forehead and muzzle black. 



a'. Parietal region narrower (42-47 mm.) P. j;. porous. 



V . Parietal region wider (49-58 mm.) P.p. pictus. 



h. Either muzzle or forehead whitish. 



v. Size smaller, muzzle whitish P.p. ubangensis. 



c'. Size larger, forehead whitish P. p. alhifrons. 



B. Facial tuberosities of skull projecting slightly 



above nasal plane, and upper one of each side 



connected with the lower one by a bony arch... P. p. congious.* 



A.— Potamochoerus porcus porcus. 



Typical locality Upper Guinea. 



General characters those of the species ; flat portion of 

 parietal region moderately wide (about 42-47 mm.) ; muzzle 

 black. 



64. 1. 16. 2 (715, h). Skull, female. West Africa; 

 collected by Mr. Dalton. Purchased, 1864. 



65. 5. 3. 3 (715, c). Skull. Niger Valley; collected by 

 Dr. W. B. Baikie. Noticed by Lonnberg, op. cit. p. 8. 



Purchased, 1865. 



" Possibly identical with albifroiis. 



