76 EINAR LÖNNBERG, MAMMALS COLLECTED IN CENTRAL AFRICA. 



length, whereas in the male they taper evenly to the posterior end. The raised lines on 

 the frontals are erect and converge rather strongly in a forward direction so that in the 

 anterior part of the frontals they are situated entirely on the upper surface, remote from 

 the lateral wall of the skull, which in the anterior part of the orbit is rounded off to- 

 wards the roof of the skull. In the female ( »emini»?) the corresponding raised lines form 

 almost horizontal crests protruding rooflike över the lateral Avall of the skull. 



The fronto -parietal suture is in the male straight and quite träns verse, in the female 

 it is semicircular, but this is no doiibt a variable characteristic. The shape of the inter- 

 parietal appears also to vary a great deal in this genus, as I have observed on the material 

 of C. g. kivuensis, where it is sometimes more, sometimes less broadly triangulär, or even 

 somewhat rounded off on the anterior side. The relative sizc seems, however, to be about 

 the same within the racial limits. For this reason it may be mentioned that in the male 

 skull, now described, the interparietal bone is comparatively very small, measuring 4,7 

 mm. in length by 6 in breadth. In the »ernini» female the same dimensions are 5,8 and 

 9 mm. 



This eomparison proves that, although a number of cranial dimensions are very 

 similar, or almost identical, these two specimens in other respects present so great dif- 

 ferences, that it is impossible to unite them within the same subspecies. There are thus 

 to be foimd, as far as can be understood from the present material, not only a small- 

 toothed and a large-toothed race of light-bellied C ricet o mys-ior ms in the same district 

 at Masisi, but there are even two different large-toothed forms. The great faculty of 

 variation displayed by the genus Cricetomys is illustrated by these facts. Although I do 

 not think that this specimen can be referred to any described subspecies I refrain for the 

 present to name it, because only one specimen is available. 



Cricetomys gambianus proparator Wroughton. 



1 ? from Bern collected 6 / 7 1913. 



This specimen agrees on the whole very well with Wroughton' s description with 

 regard to colour and cranial characteristics. The differences may chiefly be due to in- 

 dividual, or perhaps seasonal differences. These differences are as follows. The fur is 

 not 15, but hardly more than 12 — 13 mm. long, single hairs perhaps a little longer. It 

 is grey not greyish white at the base. The hind feet are not entirely white, but brown 

 in the middle of the upper side. The length of the hind foot of this dry specimen is not 

 quite 68 mm. 



The cranial measurements do not present any difficultics for the identification. 



Createst length of skull 76,7 mm. 



Basilar » » » 64 » 



Condyloincisive length of skull 72 » 



Zygomatie breadth of skull 32,5 » 



Nasals 31,2 » 



Palatal foramina 8 » 



Diastema 24 » 



Interorbital breadth 11,3 » 



Upper molar series 11,3 » 



Greatest breadth of m 1 3,4 » 



