376 Mr. O. Thomas on 



T. gamhiana. General colour pale, dorsal area tlarkenerl. 

 Feet short in proportion to the size of the animal and un- 

 usually broad, so as to give them the appearance of those of 

 a rat rather than of a }2:erbil. Tail about as long as head and 

 body, practically untufted, brown above, darkening to black 

 terminally, sides buffy, under surface whitish. 



Skull short, broad, shaped more as in T. (fiffardi than in 

 the other West-African species, in which it is larger and 

 narrower. Interorbital region flat, its edges but little ridged, 

 strongly divergent, forming distinct postorbital angles. 

 Posterior palatal foramina fairly long. Bullae very small for 

 those of a true Tatera. 



Dimensions of tlie type (measured in flesh) : — 



Head and body 150 mm.; tail 147; hind foot 30; 

 ear 16. 



Skull : greatest length 36 ; condylo-incisive length 33 ; 

 zygomatic breadth 18"0 ; nasals 14:*8; interorbital breadth 6; 

 breadth of brain-case 15"0 ; palatilar length 17"3 ; palatal 

 foramina 6" 7 ; bulloe, greatest horizontal diameter 10 ; upper 

 molar series i!)'\. 



Hah. Gambia. Type from Kudang ; alt. 100'. 



Type. Adult female. B.M. no. 11. 7. 24. 4. Original 

 number 8. Collected 16th May, 1911, and presented by 

 Dr. E. Hopkinsou, after whom I have named the species. 

 Three specimens examined. 



This gerbil is probably mo^t nearly allied to the T. g'lfardi 

 of Gambaga, Gold Coast Hinterland, but is distinguished by 

 its smaller and narrower molars and smaller bullae. From all 

 the other West-African species it is readily separable by its 

 rat-like feet and short broad skull. 



Epimys walamhe pedester, subsp. n. 



Foot much longer than in true E. icahx7)ibcv^ of Kho.lesia 

 and S. Congo. 



General characters quite as in icahimbce. Colour near 

 " raw umber " above, sn)oke-grey below. Feet less white 

 than in true tcalambce, near " smoke-grey," each hair on 

 them grey basally, whitish terminally. Tail thinly iiaired, 

 its underside little lighter than its upper. 



kSkull with the characteristic widely spread zygomata, 

 large bullae, and large teeth distinguishing icalanibce from 

 hindti, medicatus, and their allies. 



* Mtis u-alamhcr, Wroughton, Mem. Manchester Lit. «S: Phil. Soc. li. 

 pt. ii. p. 21 (1007). 



