Mammals from Lake A 'garni, &c. 393 



10. Graphturus icoosnami, sp. n. 



<? . 38. North of Okwa, Kalahari. 



? . 1. Molopo River. 



A large pale grey-coloured species allied to G. angolensis, 

 de Wint. 



Size and general proportions about as in G. angohnsis. 

 Hair of medium length, similar to that of G. murinus. 

 General colour of upper surface pale ashy grey (between 

 ashy grey no. 2 and grey no. 1, ' Repertoire de Couleurs '), 

 rather paler on the flanks and face. Individual hairs of back 

 with dark slate-grey bases ; apical portions dingy white, the 

 extreme tips brownish. Sides of face, below eyes to ears, 

 white ; hairs with dark grey bases and white tips. Eyes 

 surrounded with dark-coloured rings. Area in front of eyes, 

 at base of whiskers, inclined to be rather dark, but not 

 markedly so. Backs of hands and feet white. Entire under- 

 pays greyish white, slightly tinged with buff. Hairs of 

 belly all with grey bases and light-coloured tips. Hairs on 

 chin and lower lip entirely white. Tail long and bushy, but 

 not to such a marked extent as in G. angolensis. Upper 

 surface of tail pale greyish white, hairs with brownish-grey 

 bases and long white tips. Extreme tip of tail pure white. 

 Underside of tail rather lighter in colour than upper surface. 



Skull about the same size as that of G. angolensis, with a 

 rather flatter brain-case and less inflated auditory bulla?. 



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



Head and body 100 mm. ; tail 86 ; hind foot 18 ; ear 17*5. 



Skull : greatest length 29*3 ; basal length 24*5 ; condylo- 

 basal length 27 - 2; basilar length 22*5; condylo-basilar length 

 24*8 ; zygomatic breadth 17 ; breadth of brain-case across 

 squamosal region 12' 7 ; breadth of brain-case across 

 occipital region 12; nasals, greatest length 1]'2, greatest 

 breadth 3"4, least breadth 1*7 ; palatal length 12 ; palatilar 

 length 9*8 ; width of palate inside m 1 3'7 ; width of palate 

 outside m l 6*3 ; length of palatal foramina 3*6 ; length of 

 upper cheek-teeth 3*4. 



Bab. North of Okwa, Kalahari. Altitude 3000 feet. 



Type. Adult male. B.M. no. 10. 6. 3. 20. Original 

 number 38. Collected June 13th, 1909. 



This handsome dormouse, so strikingly different from all 

 the other members of the genus, appears to be a desert species 

 allied to the Angolan form, G. angolensis, from which it is 

 at once distinguished by the pale greyish-white colour of the 

 dorsal surface. 



