ayid allied East- African Species. 353 



Adult skull (type) : greatest length 29 mm. ; basilar 

 length 24; condylo-incisive length 26; zygomatic breadth 

 16 ; interorbital constriction 4'8 ; squamosal breadth of 

 cranium 12 ; length of nasals 11 ; palatilar length 12'5 ; 

 length of palatal foramina 6; alveolar length of upper molar 

 series 6. 



Type localiti/. Nyama Nyango, Eusso Nyiro, East Africa. 



Type in British Museum. Original number 1787. Col- 

 lected by Mr. Robin Kemp on January 2oth, 1911. 



This species is represented in the Museum collection by a 

 long series of specimens from the type locality and the 

 Chanler Falls, Eusso Nyiro. It is evidently allied to the 

 Somaliland species, as shown by its small size and pale 

 pinkish-buff colouring. 



(17) Arvicanthis chanleri^ Dollm. 



Arvicanthis chanhri, DoUniau, Ann. & Ma^. Nat. Hist. (8) viii. p. 130 

 (1911). 



A large-sized species of the somalicus group, allied to 

 reptans. 



Size rather larger than in somalicus; tall markedly longer 

 (122 mm.). General colour much as in reptans, rather 

 lighter and yellower, the black ground-colour less dominant. 

 Ears, nose, ocular rings, and backs of hands and feet orange- 

 buff. Flanks washed with a rich buffy tint. Ventral surface 

 white tinged with buff. Tail as in somalicus. 



Skull larger than that of somalicus, in general proportions 

 equalling that of the ahyssinicus group. 



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



Head and body 131 mm. ; tail 122 ; hind foot 25 ; 

 ear 14*5. 



Adult skull (type) : greatest length 34 mm. ; basilar 

 length 27 ; condylo-incisive length 31 ; zygomatic breadth 17 ; 

 interorbital constriction 4*8 ; squamosal breadth of cranium 

 12'4; length of nasals 1 1*7 ; palatilar length 14*2 ; length of 

 palatal foramina (!)'Q ; alveolar length of upper molar series 6*5. 



Type locality. Chanler Falls, Eusso Nyiro, East Africa. 



Type in British Museum. Original number 1769. Col- 

 lected by Mr. Robin Kemp on January 23rd, 1911. 



Mr. Kemp collected three further specimens of this species 

 in the Eusso Nyiro district. 



