654 Mr. G. Dollman on 



Skull like that oi jacksom, but smaller, with shorter nasals 

 and smaller cheek-teeth. Auditory bullae less inflated. 



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



Head and body 155 mm. ; tail 160; hind foot 36 ; ear 18. 



Skull : greatest length 40*5 ; condylo-incisive length 36 ; 

 zygomatic breadth 23'5; interorbital constriction 11 ; squa- 

 mosal breadth of brain-case 18 ; length of nasals 10*3 ; 

 greatest width across nasals 6'5 ; palatilar length 15"8 ; 

 length of upper tooth-row 7. 



Hab. Marsabit. Altitude 4500 feet. 



Type-. Adult female. Original number 253. Collected on 

 February 16th, 1911. 



The affinities of this species are not easy to decide ; it 

 seems to be rather intermediate between the jacksoni and 

 oehraceus groups. From jacksoni it is distinguished by its 

 rather smaller size and the dark blackish suffusion on the 

 dorsal surface. 



The very much darker colour of the fur is sufficient to 

 separate this species from all the forms of oehraceus. Para- 

 aerus kahari, recently described by Heller from Meru Boma, 

 appears to be related to this new Marsabit species, from 

 which it is distinguished by its larger size and more buffy 

 coloration. 



Paraxerus oehraceus augustus, subsp. n. 



S. C, 264, 279; ? . A, 265, 816. Marsabit. 



A pale yellow-coloured form allied to P. oehraceus, 

 Huet. 



Size as in aruscensis. General colour of dorsal surface 

 pale yellowish buff grizzled with brown and grey, the brown 

 tint most conspicuous on the hinder part of the back. Light 

 lateral stripes almost entirely invisible. Shoulders p;ile 

 yellowish buff ; flanks pale greyish buff, faintly speckled 

 with brownish grey. Top of head similar in colour to back, 

 general effect greyish olive. Muzzle and sides of face white, 

 washed with pale buff. Eyes with narrow white lines above 

 and broad white markings below. 



Backs of hands and feet yellowish buff, paler than in 

 oehraceus. Under surface of body creamy white. Tail as 

 in oehraceus. 



Skull larger than in oehraceus, nearly equal in size to that 

 of aruscensis. 



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



Head and body 150 mm.; tail 160; hind foot 33; 

 ear 19. 



Skull; greatest length 40"2; condylo-incisive length 36; 



