KUNGL. SV. VET. AKADEMIBNS HANDLINGAR. BAND 48- N:0 5. 



105 



From H. dunni the largest of my specimens, which with regard to size and 

 age comes nearest to the type of the species quoted, differs in the following points 

 in addition to those already mentioned above. The skull of my specimen is larger 

 in all dimensions. For comparison may especially be mentioned: 



Condylobaaal length 



Least width behind orbits 



Combined breadth of upper incisors 



Diastema 



Lengt of upper toothseries 



Considering these facts it does not appear possible to identify my specimen 

 with any of the three species of Heterocephalus described, but as they undoubtedly 

 all are nearly allied I prefer to use the new name which must be given only in a 

 subspecific sense. 



The cheek-teeth of the type of this new Heterocephalus glaber progrediens are 

 quite simple in the upper jaw. In the lower jaw remains of a lateral enamel-fold is seen 

 on the first and last of these teeth on one side. In the younger specimen the two 

 anterior teeth of the upper jaw show a deep lateral fold which, however, in the 

 anterior tooth by wearing already is detached from the outer enamel -layer and ap- 

 pears as an inner central ring of enamel. In the middle tooth the lateral connection 

 of this fold still is open as in Ruppell's type of H. glaber. The third posterior 

 tooth is not yet so much worn as to show the pattern. All the three cheek-teeth of 

 the lower jaw have a deep fold as well on the lateral as the median side which 

 meet in the middle of the tooth. The fold of the lateral side of the first tooth is, 

 however, on the verge of disappearing. 



Pedetidse. 



Pedetes surdaster Thomas. 



Thomas: Ann. & Mag. Nat. Hist. 1902, Ser. 7, Vol. IX, p. 440. 

 This species was said to be not uncommon on the plains outside Nairobi, but 

 as I did not do much collecting on the steppe, I did not obtain any specimen my- 

 self. A fine specimen was, however, presented to me by Mr. Hobley. 



HystricidaB. 



Hystrix galeata Thomas. 



Thomas: Ann. & Mag. Nat. Hist. 1893, Ser. 6, Vol. XI, p. 230. 

 The African Porcupines can naturally be divided in two groups according to 

 the different development of the nasals, viz. a comparatively northern, the crisiata- 



1 A 



K. Sv. Vet. Akad. TTandl. Band 48. N;o 5. 



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