130 Mr. G. Dollman on 



Hairs of back with black bases, buff-coloured subterminal 

 rings, and dark tips. Head and face much the same colour 

 as back. Ocular rings, nose, and ears bright orange-butf. 

 Backs of hands and feet light buffy orange. Under surface 

 of body greyish white tinted with buflf; the buff tint in some 

 cases almost entirely absent. Tail as in A. somalicus, dark 

 blackish brown above and light buff below. 



Skull like that of somalicus but smaller and less elongate. 

 Molar teeth rather small. 



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



Head and body 113 mm. ; tail 89 ; hind foot 25 ; ear 13. 



Skull: greatest length 29; basilar length 24; condylo- 

 incisive length 26; zygomatic breadth 16; interorbital 

 constriction 4*8; breadth of brain-case (across squamosal 

 region) 12; length of nasals 11; palatilar length 12'5; 

 length of palatal foramina 6 ; length of upper molar 

 series 6. 



Hab. NyamaNyango, Eusso Nyiro. Altitude 3000 feet. 



Type. Old male. Original number 1787. Collected on 

 January 25th^ 1911. 



The darker and richer colour of the pelage, together with 

 the smaller size, are the chief characters that distinguish 

 this species from the Somaliland form. 



Arvicanthis chanleri, sp. n. 



A large-sized species of the somalicus group. 



In general colour very much as in the foregoing species, 

 rather lighter and yellower. Ears, nose, ocular rings, and 

 backs of hands and feet buffy orange. Flanks washed with 

 a rich buffy tint. Ventral surface white tinged with buff. 

 Tail as in somalicus. 



Skull much larger than that of somalicus, in general 

 proportions equalling the abyssinicus group. 



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



Head and body 131 mm.; tail 122; hind foot 2j 

 ear 145. 



Skull : greatest length 34 ; basilar length 27 ; condylo- 

 incisive length 31 ; zygomatic breadth 17; interorbital 

 constriction 4*8 ; breadth of brain-case (across squamosal 

 region) 12*4 ; length of nasals 11'7; palatilar length 14'2 ; 

 length of palatal foramina QQ ; length of upper molar 

 series 6*5. 



Hab. Chanler Falls^ Eusso Nyiro. Altitude 3000 feet. 



Type. Adult female. Original number 1769. Collected 

 January 23rd, 1911. 



