from the Upper Gambia 6fc. 121 



Dimensions of the type (nr.easured in flesh) : — 



Head and body 105 mm.; tail 114; hind foot 22; 

 ear 14. 



Skull : greatest length 2 7'2 ; condylo-iucisive length 24" 7 ; 

 zygomatic breadth 12'5 ; inteiorbital breadth 4'3; breadth 

 of brain-case 117; palatilar length 11*8; palatal foramina 

 5'8 ; greatest horizontal diameter of bulla 5'5 ; length of 

 upper molar series 4*8. 



Hah. As above. 



Type. Adult male. B.M. no. 11. fi. 10. 61. Original 

 number A. 72. Collected 14th April, 1910. 



This is the first Arvicanthis of the harharus group to be 

 found in West Africa. It is strikingly like the A. zebra of 

 the Egyptian Soudan, but has a smaller skull. From 

 A. dunni of the same region it differs by its less buffy 

 colour and smaller bullie. 



I have named this beautiful little animal in honour of its 

 discoverer, to whom the National Museum is indebted for 

 the donation of the present valuable collection. 



19. Arvicanthis linulus, Thos. 

 Ann. & Mag. Nat. Hist. (8) vi. p. 429 (1910). 



c?.A.80. Gamon, French Gambia. 100'. B.M. no. 

 11. G. 10. 69. 



c?.A. 46. Gemenjulla, French Gambia. 50'. 



$ . No exact locality. 



General appearance as in A. dorsalis, but with faint 

 indications of a light lateral bandins;. 



Now that the skins of this interesting species have been 

 remade, they show on the shoulders and flanks indications of 

 a light spotted banding, apparently corresponding to the 

 prominent banding found in the A. striatus group. Indis- 

 tinct lighter spots are, however, often found in the lighter 

 forms of true A. dorsalis, and in A. linuhis these are 

 unusually evident and in linear series. 



The skull has a comparatively broad interorbital region, 

 as in A. striatus. 



20. Epimi/s daltoni^ Thos. 



^. B. 1. Upper Nicola Coba, Gambia. 500'. 



S.A.15. Diakaba, Gambia. 100'. 



This species was originally described as from " West 

 Africa — probably Fernando i'o," but the close resemblance 

 that Mr. Fenwick Owen's specimens bear to the type seems 



