^famviah frotn East Africa. 125 



Tijpe. Old female. Origiual number 1894. Collected ou 

 February 12tli, lUU. 



Tiie very much larg;er skull and lifjliter-coloured pelage 

 are the chief points that distinguish this new form from the 

 allied race, C. f/ambianus henytns'is. 



Acomys kempi, sp. u. 



c?.1735; ? . 1736. Chanlcr Falls, Eusso Nyiro. 



Related to A. i(/7uius, Dollm., but very much paler in 

 colour and with a longer tail. 



Size of body rather less than in A. ignitus, skull con- 

 siderably smaller. Tail comparatively long. General colour 

 of upper surface pale orange-buff, Avashed with pale slate- 

 grey down the middle of the back. Flanks pale orange-buff 

 (between yellowish salmon no. 1 and cinnamon no. 1, 

 ' Repertoire de Couleurs '), very faintly speckled with 

 brownish, the general effect very like that occurring in 

 A. ivitherhyi, de Wint. As in A. ignitus and the other allied 

 species, the buffy tint on the flanks is sharply marked off 

 from the white nnderparts. Nasal region and forehead 

 washed with slaty grey. Backs of hands and feet dirty 

 Avhite. A'entral surface white. Tail long and with well- 

 marked dorsal and ventral surfaces ; caudal hairs as in 

 A. ignitus. 



Skull smaller than that of ignitus, Avith a narrow brain- 

 case; zygomatic arches almost parallel; auditory bulla? 

 small and uuinHated^ markedl}'^ different to the bullte of 

 ignitus. 



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



Head and body 103 mm. ; tail 106 ; hind foot 16 ; 

 ear 17. 



Skull: greatest length 284; basilar length 2r5 ; con- 

 dylo-basilar length 23*7; condylo-ineisive length 2o-5 ; 

 zygomatic breadth 12"5 ; iuterorbital breadth 4*5; breadth 

 of brain-case (across squamosal region) 12 ; length of 

 nasals 11 ; width of palate (inside m^) 3 ; length of palatal 

 foramina 6*5 ; length of upper molar series 4. 



Hab. Chanler Falls, Eusso Nyiro. Altitnde 3000 feet. 



Type. Adult female. Original number 173G. Collected 

 on January 18th, 1911. 



This species is distinguished from A. ignitus by its far 

 paler eoloixr, longer tail, and very much smaller skull with 

 less inflated bullae. In general colour it most nearly re- 

 sembles A. loitherbyi, a species described by de Winton from 

 El Kowa, Soudan, bnt the dimensions of the two animals 



