536 



MR. R. 1. POCOCK ON THE EXTERNAL 



nostrils slope upwards and inwards with a slightly sinuous curve 

 to the narrowed, rounded summit. In S. lencomystcuv the 

 gi-eatest width is about midway between the nostrils and the 

 lower edge, which is straighter than in ^S'. scrofa, and the height, 

 as comfjared with the width, is considerably greater tlian in ilie 

 latter. (Text-Iig. U.) 



In Potamochiiarus porcus the upper edge is much more wideJj'' 

 rounded tJian in the two species of Sus, and the ini'ero-lateral 

 margins at the widest part of the rhinarium below the level of 

 the nostrils is not so widely rounded, the edge from that point 

 inclining inwards and upwards, being very lightly concave. 

 (Text-fig. 35, 13.) 



Text-figure 34. 



A, B. Front and side views of rhinarium oi Sus leucomystax. 

 C, D. The same of S^ts scrofa. 



In two species of Peccary, the collared {D. tajacu=torqicaius) 

 and white-lipped (D. pecari=labiatus), the rhinarium is as wide 

 on a level Avith the, upper edge of the nostril as below that 

 point, which is not the case in tius or Potamochoirus. (Text- 

 fig. 35,0.) 



In Phacochcerus the rhinarium differs from that of the genera 

 described above in several particulars. It is about twice as wide 

 as high, has a lightly convex upper edge, the lateral margins 

 sti'ongly convex round the nostrils, and sinuously concave below 

 where tliey form a definite angle with the lower edge, which is 

 lightly concave, especially in the middle line. (Text fig. 35 A.) 



It is not possible to determine the exact shajie of the rhinaria 



