new African Mammals. 429 



animal than T. gambiana, and differs by the skull-characters 

 above described. 



In addition to T. gambiana, Mr. Fenwick Owen obtained 

 in the Gambian region examples of T. guineas, Thos., and 

 Taterillus gracilis, Thos. 



Arvicanthis linulus, sp. n. 



Like A. dorsalis, but conspicuously smaller. 



External appearance quite as in A. dorsalis, the colour as 

 in the paler races of that animal. Fur coarse; hairs of back 

 about 7 mm. in length. General colour of fore-back grizzled 

 greyish buff, becoming more ochraceous posteriorly; under 

 surface white, edged on each side with a pinkish-buff line. 

 Ears and a spot above and below each eye ochraceous buff. 

 Dorsal black line commencing between the ears and running 

 to the root of the tail, the hairs on each side of it rather 

 lighter than the general colour. Hands and feet light 

 pinkish buff. Tail dark above, dull ochraceous laterally, dull 

 buffy below. 



Skull similar to that of A. dorsalis, but far smaller. 



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



Head and body 94 mm. ; tail 115 ; hind foot 23 ; ear 15. 



Skull : tip of nasals to hinder angle of frontals 20 ; 

 nasals 9'7 ; interorbital breadth 4*6 ; palatal length 14*2 ; 

 diastema 6"8 ; palatal foramina 6 ; length of upper molar 

 series 4*6. 



Bab. Gamon, French Gambia. Alt. 100'. 



Type. Adult male. Original number A. 80. Collected 

 20th April, 1910, and presented by Mr. G. Fenwick Owen. 



This is a pygmy W. -African representative of the southern 

 A. dorsalis, but is so much smaller that it cannot be considered 

 merely as a subspecies, especially as no men-ber of the dor- 

 salis group is known to occur in any of the vast area separating 

 the two forms. 



Arvicanthis dorsalis phosotis, subsp. n. 



Like A. d. maculosus, Osg., but very much greyer, espe- 

 cially when viewed from behind, the ochraceous suffusion on 

 the upper surface a much paler buffy except just on the 

 rump. Ears at once distinguishable from those of maculosus 

 and rosalia by their minute hairs being brown or greyish, 

 not ochraceous, although the ochraceous tuft at the anterior 

 base of the ears is still present. Light patches above and 

 below eyes inconspicuous, buffy, not ochraceous. 



Skull and teeth as in maculosus, equally larger than in 

 rosalia. 



