658 On new Mammals from East Africa. 



dylo-incisive length 28*5; zygomatic breadth 15'4 ; squa- 

 mosal breadth of brain-case 13*7 ; interorbital constriction 

 4"7; length of nasals 12; palatilar length 13*5; length of 

 palatal foramina 6"8 ; length of upper molar series 4"8. 



This race is evidently closely allied to both iheanus and 

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

 colour. 



I take this opportunity of describing a further new species 

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

 Lake Kivu District. 



Thamnomys hemjn^ sp. n. 



Allied to T. venustus, 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 venustus. General 

 colour of dorsal surface bright orange-rufous, the reddish 

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

 much as in Thaninomys 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 

 shoulders 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 ; uniformly dark brown in colour. 



Skull larger than that of veyiustus, with longer nasals and 

 palatal foraniina, more inflated auditory bullas, and much 

 larger and heavier molars. 



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



Head and body 141 mm.; tail lb9 ; hind foot 27-5; 

 ear 22-5. 



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

 incisive length 32 ; zygomatic breadth 16"4 ; interorbital 

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

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

 mina 8*8 ; length of upper molar series 7. 



Hah. Buhamba, near Lake Kivu, Congo Beige. Altitude 

 60U0 feet. 



