and allied East- African Species. 345 



Skull a trifle smaller tlian that of ahyssinicus, with smaller 

 molars. 



Dimensions in millimetres (measured in the flesh) : — 



Avei'age of 



10 adults. Max. Min. 



Head and body 158 177 142 



Tail 114 125 105 



Hind foot 80 32 28 



Adult skull (type) : greatest length 35 mm. ; basilar 

 length 28'4 ; condylo-incisive length 32*8 ; zygomatic 

 breadth 17'9 ; interorbital constriction 5; squamosal breadth 

 of cianium 13'5; length of nasals 134 ; palatilar length 15"6; 

 lengtii of palatal foramina 7"2 ; alveolar length of upper molar 

 series 6*5. 



Type locality. Kibero, LFnyoro, Uganda. 



Type in British Museum^ no. 2. 11. ] . 16. 



In addition to a series from the type locality, this form is 

 represented in the Museum collection by specimens from the 

 following localities : — Burumba (Ankole), Ruwenzori, En- 

 tebbe, Mbarara (Uganda), Masaka (Uganda), and Kigezi 

 (Uganda). 



This race would also appear to range northwards towards 

 the Bahr-el-Ghazal, as a series of specimens from Lango and 

 Niniule, recent accessions to the collection, undoubtedly 

 represent true rubescens ; it is also noted by Heller as 

 occurring near Lado and Gondokoro. 



(9) Arvicanthis ahyssinicus nuhilanSf Wrought. 



Arvicantliis a. nubilmis, Wroughton, Ann. & Mag. Nat. Hist. (8) ir. 

 p. 539 (1902). 



A medium-sized, dark brownish olive-coloured race, 

 •without dorsal stripe. 



Size of body, hind foot, and tail about as in the last form. 

 General colour a good deal darker than in ruhescensj the 

 black ground-colour quite as dark as in niloticus, 13uff- 

 coloured annulatioiis on hairs well-marked, the general 

 speckled effect about as in the two following races. No trace 

 of dark dorsal stripe in adult pelage. Flanks a good deal 

 paler than back. Backs of hands and feet brownish, 

 speckled with buff. Vential surface much as in ruhescens^ 

 the white bair-tips rather longer, giving the belly a lighter 

 appearance ; this character, however, is not constant, some 

 specimens of rubescens being quite similar to nubilans as 



