520 Mr. G. Dollman on 



distingiiisliaLle from X. dahagola rufifrons, where ihe rufous 

 area spreads on to the forehead and liead. 



Grnphiarua microtis satvratus, Dollm. 

 ? . 1548, 1707, Solai, Mount Kenya. 



Dipodillus diminutus, sp. n. 



Allied to Dijjodillus harwoodi, Thos., but smaller in size, 

 with much smaller teeth, and more rufous in colour. 



Size and proportions less than in D. harwoodi. General 

 colour of upper surface bright orange-rufous (between bistre 

 no. 3 and tan-colour no. 2, 'Repertoire de Couleurs'), 

 slightly darker down the middle of the back, but not nearly 

 so much as in harwoodi. Hairs of back with pale slate-grey 

 bases, bright orange-buff subterminal rings, and short 

 brownish tips. Flanks pure orange-buff in colour, hairs with 

 light grey bases paling to white towards the tips ; subter- 

 minal rings orange-bnff, extreme tips of hnirs brownish. 

 Muzzle and top of head orange-buff, an indistinct dark line 

 extending from the nose to the forehead. Cheeks and lips 

 white, hairs white to roots. Sides of face below eyes buff, 

 speckled with black. Ears clothed with short brownish 

 hairs. Backs of hands and feet white. Entire under surface 

 white ; hairs of l;e!ly white to roots. Tail much as in 

 D. harwoodi, rather shorter, but similar in colour. 



Skull much smaller than that of D. harwoodi; with nar- 

 rower brain case, shorter nasals, smaller auditory bullae, and 

 very much smaller teeth. 



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



Head and body 67 mm ; tail 79 ; hind foot 20 ; ear 10. 



Skull : greatest length 23'6 ; condylo-incisive length 20 ; 

 zygomatic breadth 12*3 ; interorbital breadth 4'7 ; breadth 

 of brain-case (across squamosal region) 11 '2; length of 

 nasals 9 ; width of palate (inside m^) 2"8 ; length of palatal 

 foramina 4 3 ; length of upper molar series 3"2. 



Hub. Nyama Nyango, Eusso Nyiro. Altitude 3200 feet. 



7j//;e. Old male. Original number 1861. Collected on 

 February 2nd, 1911. 



This Gerbil is at once distinguishable from the Naivasha 

 species, D. haruwodi, by its brighter colour, smaller size, and 

 very much smaller teeth. 



Taterillus tenebricus, sp. n. 

 Allied to T, harrmgtoui, Thos., but Mith dorsal surface 



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