348 Mr. G. Dollman on Arvlcanthis abyssinlcus 



Hoi). Naivaslia, British East Africa. 



Type. In British Museum, no. 0. 6. 21. 34. 



Mr. Kemp, during Mr. C. D. Budd's Expedition in British 

 East Africa, collected a large series of tliis form at Baringo 

 and Rumruti (Laikipia Plateau). A specimen from Nandi, 

 also collected by Mr. Kemp, undoubtedly represents the same 

 race, so that it is evident that iwcBceps is widely distributed 

 over this part of East Africa. 



(12) Arvicanthis ahi/ssinicus netcmanni, Matscli. 

 Mus neuvianni, Matscliie, SB. Ges. naturf. Fr, Berl. 1894, p. 204. 



In size about equal to ?iairobce, but darker and more ochra- 

 ceous in colour ; evidently closely allied to both nairohce and 

 prceceps. 



Size of body and tail about as in nairohce; hind foot 

 rather smaller, average length 26 ram. General colour like 

 that of prceceps, but richer and darker in colour, the black 

 ground-colour more evident and washed with ochraceous 

 buff, the reddish tint paling on the flanks to yellowish buff. 

 No trace of dorsal stripe. Backs of hands and feet brownish, 

 speckled with buff. Underparts as in i^rceceps. Tail like 

 that of nairohce. 



Skull rather smaller than in the otlier races of ahyssinicus. 

 Auditory bullae less inflated than in prceceps or nairohce. 



Dimensions in millimetres (measured in the flesh) : — 



Average of 



7 adults. Max. Min. 



Head and body 139 149 132 



Tail 106 111 101 



Hind foot 26 27 25-5 



Adult skull : greatest length 32*8 mm. ; basilar length 

 27*5; condylo-incisive length 31"5 ; zygomatic breadth 17; 

 interorbital constriction 4*8 ; squamosal breadth of cranium 13; 

 length of nasals 12*4; palatilar length 15; length of palatal 

 foramina ^'Q ; alveolar length of upper molar series 6*3. 



Type locality. Burunge, Irangi, south of Kilimanjaro. 



The above description is taken from a series of specimens 

 recently collected by Mr. Kemp at Taveta, Kilimanjaro. 

 This southern race was also represented in a collection from 

 Yoi ; so it is evident that the distribution of Jieumanni ex- 

 tends eastwards from Kilimanjaro towards the coast and 

 southwards towards Mpapua. 



The three forms nairohce, prceceps, and nciimanni appear to 

 be very closely related to one another, as would be expected 



