152 Mr. G. Dollman 07i the 



Division A, 



Lower incisors with only one very deep groove. General colour very 

 dark j ventral surface of tail dull black. 



Group 1. 

 vi^ with 5 laminae. 



(1) Otomys denti, Tlios. 



Otomys denti, Thos. Ann, & Mag. Nat. Hist. (7) vol. xviii. p. 142 

 (1906). 



Lower incisors vvitli only one deep groove, large inner 

 portions terminating in two sharp points, sharper and longer 

 than in the other groups ; small outer portions sharj)ly pointed 

 and usually very pale in colour, a feature so marked that the 

 skulls of this group cau be immediately recognized. Brain- 

 case flat. 



In colour this species is exceedingly dark, the dorsal sur- 

 face being brownish black (" blackish brown (3) " si)eckled 

 •with "auburn," Bidgway, 1912) speckled with coppery buff. 

 Backs of hands and feet blackish brown. Ventral surface of 

 body slate-black slightly speckled with buff. Tail dull black 

 above and below. Witli the exception of the followini>- 

 species, all the other East-African Otomys have a light 

 under surface to the tail. 



Dimensions of the type : — 



Head and body 157 mm. ; tail 89; hind foot 27 ; ear 21. 



Skull: greatest lengtli 36"7; basilar length 30*2; zygo- 

 matic breadth 183 ; breadth of brain-case 15"5 ; lengtli of 

 nasals 14'7 ; breadth of anterior expanded portion 7 ; pala- 

 tilar length 1G*8 ; length of upper molar series from front 

 alveolar border to back of last molar 8"3. 



The molars are rather small, iu^ possessing only 5 laminae. 



?Iah. Ruwenzori East. Altitude 6000 feet. 



Type. Old female. B.M. no. 6. 7. 1. 69. 



Externally denti and the following species are immediately 

 recognized by their very dark colour and the dark ventral 

 surface of the tail. 



Group 2. 

 m^ with 6 laminae. 



(2) Otomys kempi^ sp. n. 



Allied to O.denti^lXio^., but distinguished by m' possessing 

 6 instead of 5 laminge. 



In general dimensions a trifle larger than the Euwenzori 

 species. The description given above for the colour of denti 



