60 Mr. 0. Thomas on new Forms of 



Hab. Panyam, Bauclii Province, Northern Nigeria. 

 Alt. 4000'. 



Type. Adult female. B.M. no. 12. 1. 16. 19. Original 

 number 83. Collected 16th September, 1911, and presented 

 by the Rev. G. T. Fox. Six specimens. 



Distinguished from its ally D. nigrifrons — near zoologically, 

 but very distant geographically — by its longer skull, the 

 whitish pre-aural patches, and the reduced black markings. 



Dipodillusjordani, sp. n. 



A very small gerbil, apparently representing in Algeria 

 the little D. marice and D. henleyi of Lower Egypt. 



Size less than in D. simoni, greater than in marice and 

 henleyi. General colour dull sandy, very much as in the 

 first-named, the dorsal hairs prominently tipped with 

 dark brown, so that the general tone is much darker and 

 duller than the bright clear huffy of D. henleyi. Supraorbital 

 light patches not very white, but extended backwards nearly 

 to the ear, where they almost join the snowy white post- 

 auricular patches. Ears small, their edges brownish. Soles 

 naked, with the usual six pads. Tail longer than the head 

 and body, greyish white below, pale brownish above and at 

 the end, which is inconspicuously pencilled, its hairs about 

 5 mm. in length. 



Skull with the broad brain-case and small muzzle charac- 

 teristic of simoni, henleyi, and other allied species. In size 

 it is markedly less than in simoni, larger than in marice and 

 henleyi. Supraorbital edges with fine sharp and slightly 

 overhanging ledges, about as in D. henleyi. Bullae large, 

 exceeding those of the larger D. simoni, about equalling 

 those of D. henleyi. Molars small. 



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



Head and body 67 mm. ; tail 80 ; hind foot 19*5 ; 

 ear 9. 



Skull : greatest length 22*4 ; greatest diagonal length to 

 back of bullae 22*3 ; condylo-incisive length 20*2 ; nasals 7'7 ; 

 breadth of brain-case 11'6 ; palatal foramina 3*8 ; diagonal 

 horizontal diameter of bulla 8*5 ; upper molar series 3*0. 



Hab. (of type). Guelt-es-Stel, Central Plateau of Algeria. 

 Alt. 900 m. 



Type. Old male. B.M. no. 12. 6. 12. 100. Original 

 number 111. Collected 22nd April, 1912, by Dr. K. Jordan. 

 Presented by Lord Rothschild. 



I have hitherto hesitated to describe this little gerbil on 



