KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58. NIO 2. 



75 



Even if the cranial dimensions as far as is known and for reasons mentioned above 

 do not give any sharp distinguishing characteristics I feel compelled to regard this small- 

 toothed, white-bellied Cricetomys from Masisi as a new subspecies which I call: 



Cricetomys gambianus kivuensis, because the type locality is situated only three 

 days march from the Lake Kivu. As type I select 11:0 152 of Oaptain Arrhenius's collec- 

 tion, an adult female, which has been described above as well to its colour as cranial di- 

 mensions. 



Cricetomys sp. 



The above mentioned Cricetomys specimen (»11:0 150» of the collection) from Ma- 

 sisi in which thcre is no sharp line of demarcation is a male belonging to the large-toothed 

 group. With regard to its exteriör it differs in the following points from the female 

 ( »n:o 151 »), which in the above with doubts has been referred to C. g. emini. The line of 

 demarcation is not sharply defined, and the under parts are not so purc white, but some- 

 what tinged with buffish except on the throat. The back is not quite so dark, and the 

 cinnamon of the flanks is more developed. The small white spöt on the upper lip is also 

 tinged with light cinnamon. The dark and light portions of the tail are about equal in 

 length. The upper parts of hands and feet as in the emini(1) female very dark, »warm 

 sepia », but with light margins and white digits and toes. 



The skulls ha ve partly very similar dimensions: 



t? 



Greatest length 75,2 mm. 



Condylobasal length 71,8 » 



Zygomatic breadth 34 » 



Nasals 31,0 » 



Least interorbital breadth 10,4 » 



Diastema 24 » 



Palatal foramina 8,4 » 



Upper molar series 12,3 » 



Breadth of m l 3,8 » 



Greatest breadth across the palate outside m 1 . . 14,3 » 



Width of posterior choanre 5,6 » 



In other respects, however, the skulls of this male specimen and that of the female 

 »emini» differ from each other. The preorbital portion of the former is more compressed 

 so that its transverse diameter is only 11,5 mm. against 13 mm. in the latter. 



Width across outer sides of m l 

 » » » » rn z 



14,3 mm. 

 13,0 » 



15 mm. 

 14 » 



The palate is thus broader in the female. The upper side of the skull looks very 

 different in these two specimens. That of the female {»emini»?) appears much broader 

 than the other. Its nasals are broader, almost equally broad for the greater part of their 





