KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:O 5. 105 
From H. dunm 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: 
. H. from 
H- dunni Cuaso" Nyiri 
| z 
| mm. | mm. 
IkCondylobasal length .-: ss « s.. 6 sy, sc ss. AR ss 23 | 26 
IKGAStLAwIG LED GÖITGAKORDICS: 6 vet oMel el fe Ler 6 Bele fe tele] a se 5,5 | 6 
Combined” breadth of upper INCISOrS . . «cc. sc 0 | 3,0 | 3,3 
Diastema. SKI Speed OT RO EST. AR Raser dad 10 
| Lengt, of:upper toothseries:. =». » .s « . fee sö. se ss 2,9 3,3 
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 RÖPPELL'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. 
Lv 
Pedetidae. 
Pedetes surdaster TirroMAs. 
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. 
Hystricidee. 
Hystrix galeata THOMAS. 
THoMaAS: 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 cristata- 
K. Sv. Vet. Akad. Handl. Band 48. N:o 5. 14 
