1903. | MAMMALS FROM THE SOUDAN. 297 
Size small, and feet short. General colow above soft sandy 
buff, slightly lined on the back with the dark tips to the hairs, but 
without any marked darker dorsalarea. Along the back the bases 
of the hairs are plumbeous, but laterally, still within the sandy area, 
the hairsare broadly ringed with white subterminally, though this 
colour does not show on the surface. Under surface pure sharply 
defined white as usual. Cheeks, a prominent patch above and 
behind each eye, and another behind the ear white. Whole of 
fore limb white, hind limb with a sandy line down its outer side, 
the inner side and whole of feet snowy white; palms and soles 
thickly hairy. Tail short for this group, pale sandy above, 
darkening towards the pencilled end; white below. 
Skull unfortunately broken in the single specimen. Molars 
markedly smaller and lighter than in the common Soudanese 
G. pygargus. 
Dimensions of the type :— 
Head and body 87 mm.; tail 100; hind foot (s. u.) 24; ear 11. 
Length of upper molar series 3°7. 
Hab. and type as given above. 
This little Gerbille is distinguished from its neighbour 
G. pygargus by its smaller size and shorter tail. Its close resem- 
blance to Dipodillus stigmonyx has already been noted. 
11. ARVICANTHIS DUNNI, sp. n. 
103. ¢. Kaga Hills, W. Kordofan (about 120 miles W. of El 
Obeid). 20 November, 1902. 
“ Dug out of reddish sandy cultivation soil, from among the 
natives’ crops of dukhan.”—H. 1. D. 
A many-striped species of the A. barbarus group; allied to 
A, zebra, but smaller, paler, and with the ight and dark stripes less 
contrasted. 
Size small, the smallest of the group. General pale ground- 
colour buff, the lateral darker stripes brown instead of black. 
Head coarsely grizzled buffy and brown. Central dorsal stripe 
beginning on the crown, very narrow, blackish, but not so deep a 
black as in A. zebra; outside this there are on each side five 
uninterrupted buffy stripes, separated from each other by broad 
brown bands, each of which is divided down the centre into two 
by an interrupted band of light, an arrangement essentially as in the 
other species. The light spaces are throughout clear buff, and the 
dark lines brown, a clear buffy line passing along below the outer- 
most dark line and edging the pure white of the belly. In 4. zebra 
the outer lines at least are white, only those near the spine being 
buffy. Eye-ring buffy. Ears dull ochraceous, without darker 
marking. Arms and legs pale buffy, becoming white on the 
fingers and toes. ‘Tail well-haired ; dull ochraceous above, with a 
narrow and inconspicuous mesial line of black ; whitish below. 
Skull conspicuously smaller than in 4. zebra and the other 
species of the group, with rather larger bull ; incisors narrower, 
but molars rather larger in proportion. 
