KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58. NIO 2. 67 



(to base of tail 450), and the length of the tail without hairs about 220 mm.; the length 

 of the dry ear 33 mm. The subcaudal scales are about 15; the proximal ones very large, 

 measuring 12 — 13 mm. in length, but the most distal ones only about 3 mm. 



Greatest length of skull 60 mm.; greatest zygomatic breadth 41,5 mm.; least width 

 of nasals 6 mm.; height of infraorbital foramen 7 mm.; basal length of skull 53,5 mm.; 

 upper molar series 13,7 mm.; diastema 13,3 mm.; mandible inside of incisors to condyle 

 37 mm.; height of mandible to coronoid 22,5 mm. 



These differences appear to indicate that at the localities mentioned above there 

 is to be found a somewhat larger race than the typical one in Uganda. This is also in 

 agreement with other similar facts, no doubt depending upon the fact that the conditions 

 of life for the western forest animals already in Uganda are somewhat less favourable 

 than in the upper Congo forests, through which circumstances a racial difference is 

 produced. 



Anomalurus pusillus Thomas. 



A female specimen from Masisi, Febr. 1914. 



This specimen has a greater zygomatic width (32 mm.), but agrees otherwise with 

 Thomas' s description. , 



Idiurus zenkeri kivuensis n. sp. 



An adult and a young specimen from Masisi in the Kivu-district. 



These specimens agree much more in their general characteristics with Idiurus 

 zenkeri Matschie than with /. macrotis Miller. Especially the cranial dimensions differ 

 from those of /. macrotis. 



It was more difficult to decide, whether this Idiurus from the Kivu district could 

 be regarded as identical with /. zenkeri from Cameroon, or not, although from a geo- 

 graphical point of view it did not appear much likely. To make sure about this I took the 

 liberty of asking the author of the Cameroon species, Professor Matschie, concerning 

 the same, and I am very much indebted to him for valuable information concerning this 

 matter. 



The general colour of the upper parts of this Idiurus is »deep bistre» (Dauthénay, 

 Rép. de Coul. 303, 1), because the tips of the fur has this colour, but basally it is dark 

 fuscous grey which sinnes through here and there. The fur on the lateral membranes 

 is dark brown, »sepia» (1. c. 300, 2), or perhaps better Ridgeway's »fuscous». On the 

 interfemoral membrane the dark hairs are partly tipped with a påle shade of »deep bistre». 

 The upper side of the fore-legs are like the back; that of the hind legs is darker, more like 

 the interfemoral membrane in colour. Scattered över the back, but more numerous on 

 the sacral region, on the sides and on the membrane there are to be seen very long and 

 very slender whitish hairs which probably have a sensory function. The general fur on 

 the back has a length of about 10 mm. 



The chin is white. The lower side of the body is grey between »slate grey» (362, 1) 



