and a I lied East- Afr I'ca n Spec les. 345 



Skull a trifle smaller than that of ahyssinicua, with amaller 

 molars. 



Dimensions in millimetres (measured in the flesh) : — 



Avi'j-nge of 



10 lulults. Max. Miri. 



nofid Rnd body IM 177 142 



Tail : 114 125 105 



Hind foot 80 32 28 



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

 length iiS'4 ; condjlo-incisive length 32'8 ; zygomatic 

 breadth 17"9 ; interorbital constriction 5; squamosal breadth 

 of cianium 13'5; length of nasals 13 4 ; palatilar length 15'G; 

 length of palatal tbraniiua 7"2 : alveolar length of ui)per molar 

 series 6"5. 



Type localitij. Kibero, Unyoro, Uganda. 



Type in British ^luseum, no. 2. 11. ]. 16. 



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

 rej)reseiited in the Museum collection by specimens from the 

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

 ttd)be, Mbarara (Uganda), Masaka (Uganda), and Kigezi- 

 (Uganda). 



This race would also appear to range northwards towards 

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

 Nimule, recent accessions to the collection, undoubtedly 

 represent true ruhescens ; it is also noted by Heller as 

 occurring near Lado and Gondokoro. 



(0) Arvicanthis ahyssinicus nuhilans, Wrought. 



Arvicanthis a. nubilans, Wroughton, Ann. & Mag. Nat. Hist. (8) ir. 

 p. 539 (1902). 



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

 Avithout dorsal stripe. 



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

 General colour a good deal darker than in ruhescens^ the 

 black ground-colour quite as dark as in niloticus. Buff- 

 coloured annulations 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. Ventral surface much as in ruhescens, 

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

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

 specimens of ruhescens being quite similar to nuhilans as 



