120 Mr. O. Thomas on small Mammals 



13. Euxems erythropus, Geoff. 

 (J . B. 32, B. 36. Daley, Fouta Djalon. 3000'. 



14. Tatera guinece, TIios. 



Twelve specimens, various localities. 



Described in 1910* on specimens obtained by Dr. W. J. 

 Ansorge in Portuguese Guinea. 



15. Tatera gambiana, Thos. 



(J. B. 14, 17, 18. Marakissa, Gambia. 500'. 

 S . B. 12, 15, 20 miles N.E. of Keduga, Gambia. 450'. 

 Described last year from this series, no. B. 14 (B.M. 

 no. 11. 6. 10. 36) the type. 



16. Taterillus gracilis, Thos. 



Six specimens. Gemenjulla, French Gambia. 50'. 

 Four, Gamon. 100'. 



17. ArvicantJds setosus, Thos. 



Kine specimens. Gemenjulla. 50'. 

 ? . A. 87. Gamon. 100'. 



The type and only previously known specimen of this 

 species was obtained by Ca])t. Gifford in the Fra-Fra 

 country, Northern Territory of the Gold Coast. 



18. Arvicanthis oiceni, sp. n. 



8 specimens. Gemenjulla, French Gambia. 50'. 



A small striped species of the harharns group. 



Quite similar in external appearance, number and relative 

 prominence of stripes, and general colour to the Uj)per Nile 

 A. zebra, Heugl., as represented by a specimen from Fashoda. 

 Light stripes whitisii or pale cream-colour, not the stronger 

 buffy of A. dunni. Under surface white. Ears bufly. 

 Hands and feet whitish, with bufly metapodial patches. 

 Tail long, black along its upper surface, bufly on sides and 

 below. 



Skull agreeing in size with that of .4. dunui\ but the 

 teeth rather and the bulla3 conspicuously smaller. The 

 latter are about as in A. zebra, in which animal the skull is 

 considerably larger. 



* Auu. & Mag. Nat. Hist. (8) t. p. 363. 



