658 On new Mammals from East Africa. 



dylo-incisive len^i^th 28*5; zygomatic breaflth 15"4 ; squa- 

 mosal breadtli of brain-case \?)'l ; interoibital constriction 

 4"7; lenoth of nasals 12; palatilar length 13*0 ; length of 

 palatal foramina 68 ; length of upper molar series 4'8. 



This race is evidently closely allied to both ibeanus an 1 

 tnsignis, from both of which it is distinguished by its paler 

 colour. 



I take this opportunity of describino; a further new species 

 of Tltarirnomyfi, recently collected by Mr. Robin Kemp in the 

 Lake Kivu District. 



Thamnomys kempt ^ sp. n. 



Allied to T. venustns, Thos., but considerably larger in 

 size and with very much larger molar teeth. 



Size of body greater than in any other known member of 

 the genus. Fur of back long, as in vennstus. General 

 colour of dorsal surface bright orange-rufous, the reddish 

 tint most marked on the posterior back and iiind-quarters, 

 much as in Thamnomys dryas. Hairs on posterior part 

 of back slate-black with short reddish tips ; interspersed 

 are a number of dark brownish hairs, which are most 

 numerous on the anterior portion of the body. Hairs on 

 slioulders and neck slate-black with yellowish-buff tips. 

 Flanks slaty grey washed with bright yellowish buff. Face 

 and head greyish buff; tip of nose black. Ears clothed on the 

 outside with dark brownish hairs ; inner side closely covered 

 with short golden-buff hairs. Backs of hands and feet buff"- 

 coloured, with conspicuous dark patches on the metacarpal 

 and metatarsal areas. Underparts pale buff", the hairs all 

 with slate-grey bases and long buff-coloured tips. Tail very 

 long, pencilled terminally ; uniforndy dark brown in colour. 



Skull larger than that of venustus, with longer nasals and 

 palatal foramina, more inflated auditory bullte, and much 

 larger and heavier molars. 



Dimensions of the type (measured in the flesh) : — 



Head and body 1-41 nnn. ; tail 1^9; hind foot 'll'') ; 

 ear 225. 



Skull: greatest length 36 ; basilar length 27-2; condylo- 

 incisive length 32 ; zygomatic breadth 16"4 ; intororbital 

 constriction 4*7 ; greatest breadth of brain-case 14*6 ; length 

 of nasals 14*8 ; palatilar length 15 ; length of palatal fora- 

 mina 8"8 ; length of njiper molar series 7. 



Ilah. Buhaniba, near Lake Kivu, Congo Beige. Altitude 

 6000 feet. 



