new A/rican Dormice. 319 



Skull: greatest length 249; basilar length IS'5; con- 

 dylo-basilar length 20*7 ; comljlo-incisive length 22 ; zygo- 

 matic breadth 1H*5 ; interorbital constriction 4 ; squamosal 

 l)reaclth of brain-case 11'8 ; greatest occipital breadth 11; 

 length of nasals ; greatest anterior breadth of nasals 3"3 ; 

 j*tilatilar length 7"5 ; width of palate (inside in^) 2"9 ; width 

 across palate (outside m^) 5 1; length of palatal foramina 3 ; 

 postpalatal length 11*2 ; length of npper cheek-teeth 3. 



Hob. Nvama Nyango, Eusso Nyiro, British East Africa. 

 Altitude 3200 feet. 



Type. Adult female. Original number 195. Collected on 

 February 1st, 1911, by Mr. A. Blaney Percival. 



In addition to the type Mr. Peicival obtained four further 

 specimens of this new dormouse — three from the type locality, 

 and one from the Mara River. It is interesting to tind a 

 close ally of the Somali Graphiurus extending into British 

 East Africa; the dormice collected by Mr. Percival as far 

 east as Marsabit represented the true British East-African 

 form, microtis saturatus, and were in no way related to this 

 new race of brockmani. 



Graphiurus butler i^ sp. n. 



A light ashy-grey-coloured species about equal in size to 

 murinus. 



Skin-dimensions fairly large ; hind foot large, measuring 

 17*7 mm. in length. General colour of dorsal surface pale 

 ashy grey (smoke-grey no. 3 tinted with otter-brown no. 1, 

 'liepertoire'), quite as pale as in woosnami, but washed over 

 with a light ash-coloured tint. Hairs of back with slate-grey 

 bases, liglit buffy-white subterminal rings, and liver-coloured 

 tips, in some cases darkening to brown at the extreme ends of 

 the hairs. Elanks rather more buffy than back ; line of demar- 

 cation between flanks and light ventral surface irregular and 

 ill-detined. Muzzle and head paler and greyer than back. 

 Dark ocular rings present, but not in any way conspicuous ; 

 dark markings on sides of muzzle very faint. Cheeks and 

 sides of neck pure white ; hairs all witii grey bases and white 

 tips. Backs of hands and feet wiate. Ventral surface of body 

 pale slate-grey, washed over with white and faintly tinted 

 with a pale cream-coloured wash. Tail pale liver-coloured, 

 lighter below than above. Hairs at distal end tipped with 

 white; this may be an abnormal condition, as the tail 

 appears to be of the regenerated kind and therefore the true 

 tail tip is wanting. 



Skull like that of G. ivoosnaini, but smaller, possessing 



