and allied East- African Species, 347 



Dimensions in millimetres (measured in the flesh) : — 



Average of 

 3 adults. 



Head aud body 135 



Tail 107 



Hind foot 27-5 



Adult skull : greatest length 34*3 mm. ; basilar length 29 ; 

 condjlo-incisive length 33 ; zygomatic breadth 18 ; inter- 

 orbital constriction 5 ; squamosal breadth of cranium 13'G ; 

 length of nasals 13"2 ; palatilar length 15'6; length of 

 palatal foramina 7 ; alveolar length of upper molar series 7. 



Type locality. Nairobi, British East Africa. 



In the British Museum are three specimens from the type 

 locality, and from these the above description has been taken. 



[(11) Arvicantkis ahyssinicus prceceps, Wrought. 



Arvicanthis a. ivceceps, WrouglitoD, Ann. & Mug. Nat. Hist. (8) iv. 

 p. 638 (1909). 



Closely allied to the foregoing form, differing otdy in the 

 hands and feet being golden yellow and the under surface 

 strongly tinted with buff. 



Size of body about as in nairobce, tail rather longer 

 (111 mm.), hind foot a little smaller. General colour of 

 dorsal surface quite similar to that of nairobce. No dorsal 

 stripe. Backs of hands and feet richly tinted with orange- 

 buff. Ventral surface of body dirty greyish white, washed 

 with buff. Tail Lke that of nairobce, but rather lighter 

 above. 



Skull very much like that of nairobce^ molars rather smaller, 

 but not markedly so. Brain-case narrow. 



The skull measured below is that of an old Baringo 

 specimen. 



Dimensions in millimetres (measured in the flesh) : — 



Average of 



10 adiilts. Max. Min. 



Head and body 142 152 131 



Tail Ill 116 108 



Hind foot 20-6 28 25 



Adult skull : greatest length 34:'5 mm. ; basilar length 28*3 ; 

 condylo-incisive length 33 ; zygomatic breadth 17'5; inter- 

 oibital constriction 5 ; squamosal breadth of cranium 13'5; 

 length of nasals 13 ; palatilar length 15-3 ; length of palatal 

 foramina 7 ; alveolar length of upper molar series G'5. 



