MAMMALS OBTAINED IN DARFUR. 255 



Frontal white spots of medium size, tiae bar sepavating it from 

 the temporal one on each side considerably broken by white hairs. 

 Black lines of nape very narrow, much overlaid by the white 

 liairs. Posterior black lines also at a minimum, the median one 

 on the loins scarcely more than an inch broad, and its intensity 

 much reduced by the long overhanging white hairs, the lines 

 throughout less developed and sharply defined than in any other 

 form. Chin and interramia largely intermixed with white hairs, 

 a few only being present in intermedms and none in other forms. 

 Black of under surface considerably narrowed in the ventral 

 region, the white of the flank-bands encroaching on the belly on 

 each side, while all across the latter there is an admixture of 

 white with the black hairs. Tail with the basal portions of the 

 hairs black as usual. 



Skull fairly large, decidedl}^ larger than in the type of inter- 

 onedius, but smaller than in shoce. 



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



Head and bod}^ 355 mm. ; tail 255 (not quite perfect) ; hind 

 foot 58 ; ear 24. 



Skull : greatest length (median) 68"5 ; condylo-basal length 

 66-5; zjrgomatic breadth 38-7; interorbital breadth 18; inter- 

 temporal breadth 16'3; mastoid breadth 33'7 ; palatal length 

 32"4 ; maxillary tooth-series 20 ; jo'^ on outer edge 6'5. 



Hab. and Ty^ye as above. 



A form with the white markings at a maximum, in correlation 

 with the desert characteristics of its habitat. /. erythrece is 

 smaller, shoce larger and very dark-coloured, and interniedius 

 somewhat similar in colour, but with much smaller skull and the' 

 usual wholly black underside. 



26. EuxERus CHADENSis Thos. 



S . 436. El Fasher. 



2 . 460. 35 miles S.W. of El Fasher. 



$. 1114. Jebel Maidob. 



This desert Ground-Squirrel ranges along a strip at about 

 14° N. lat. for a considerable distance, as Capt. Buchanan 

 obtained it at Zinder, French Nigeria ; the typical series came 

 from Lake Chad, and the present region is again much to the 

 east of that lake. It is of very pale colour, and comparatively 

 small (skull 58-6 i mm.), though still much larger than the little 

 JiJ. agadius of the Air region (51"5 mm.). 



27. EuXERUS ERYTHROPUS LTMITANEUS, Subsp. n. 



$ . 722. Zalingei, mouth of Wadi Aribo. 2800'. 

 c? . 803. 2 . 837, 854. Kulme, Wadi Aribo. 3300'. 

 S . 657. Foot-hills of Jebel Marra. 4000'. 

 $ . 609. Central Jebel Marra. 7200'. 

 J. 1. Dilling, Nuba Land. 2300'. 



