;, MAMMAI.S. 1_'9 



ilic present specimens of //. galtala res p. 70,7 (the younger) and 74, o (the older). This 

 shows very plainly the difference and indicates at the same time that in H. africit-auxlra- 

 //.v the nasal opening is narrowed with increasing age as the percentages from my younger 

 specimens are greater than that from THOMAS' older. 



As far as my material is concerned the nasal processes of the premaxillaries of H. 

 (/ l< nta are much broader than the same of H. africce-aiistralis. At the middle of the 

 nasal sutures their width is in the two specimens of H. gait afti resp. 17 and 22 mm. while 

 the same dimension in two specimens of H. africce-australis is resp. 9 and 13 mm. 



As THOMAS has remarked the length of the nasals of H. galtta is greater than the 

 same of H. africce-australis. Measured in a straight line these bones are in the latter 

 (semiadult) 73 mm. in the former (semiadult) 83 and (adult) 96 mm. On the contrary 

 the f rentals measure in the median line in the former 44 and in the two latter resp. 31 

 and 33 mm. In H. africoe-auxtralis the length of the nasals (in a straight line) is in young 

 specimens shorter than, and in adult about equal to the distance from the naso-frontal 

 suture to crista occijtituli*. In H. galeata the latter distance is but 70 /o (adult) to 74 /o 

 (young) of the nasal length. In H. gal fata a cri*1a xauitfali* extends from the occipital 

 crest forward over 3 /5 to -/a of the parietalia. It is thus? better developed than in H. 

 africce-australis and H. crixtata. In H. africce-australis foramen magnum extends a good 

 deal up on *f/ata occijjitaJis, so that its upper margin is only about 24 mm or less from 

 the upper margin of the occipital crest while the same distance in H. gal< afa is about 

 31 mm. So far as my material is concerned, the distance between the middle of the occi- 

 pital condyles is in H. africce-australis less than the height of foramen magnum in H. ga- 

 leata about equal to it, and in H. crivtata the transversal dimension is the greater. The 

 antero-lateral portion of law/male which is seen outside and in front of the orbit is com- 

 paratively much narrower and smaller in H. galeata than in H. africce-atixtrali*. 



There are several other cranial differences that could be pointed out in which H. 

 galrata differs from the South African as well as from the Mediterranean porcupine but 

 what is said may suffice to fully confirm THOMAS judgement which was based only on 

 one skull. 



The two specimens recorded above are chiefly blackish; the bristles forming the 

 anterior crest are to great extent whitish in the distal parts. The quills of the back are 

 ringed, the blackish rings being much broader than the white. As a rule each quill has 

 only three white rings which are narrow, often less than 1 cm. seldom if ever 1 1 /2 cm. 

 The ends are as a rule broadly white. The quills round and on the tail are wholly white 

 (the central ones) blackish at their base only. 



Hystrix galeata ambiicua n. 



(PI. 7, fig. 3). 



A third specimen from the same locality (Kibonoto) collected the 23th of May 1906 

 is more difficult to form any certain opinion about. It is very old and all sutures are 

 closed which makes the matter still more doubtful concerning the dimensions of the diffe- 

 rent bones. The skull resembles however, in several respects H. africce-australis more 

 than H. galeata. The broadest part of the frontals is, for instance, at the edge of the 



