}faunn<ils /roj7i Panyam^ N. Nigeria, 685 



13. Arvicanthis morda^v, Tlios. 

 6. 9i, 120, 121, 12G, 130, 149; $ . 98, 131, 138, 141. 



14. Arvicanthis harharus nigerice, Tlios. 

 S . 92, 122, 139. 



15. Uranomi/sfoa-ij Tlios. 

 (^. 124. 



A second specimen of this rare species is a welcome 

 accession. 



16. Dasymya foxij sp. n. 



S . 93, 97, 136, 145 ; ? . 95, 96, 127, 144. 



Allied to the Uganda D. medius ; larger, and with larger 

 teeth than the Liberian U. rufulus. 



Size about as in D. medius, or a little larger. Fur loose 

 and coarse. General colour of about the same warm brown 

 as in medius, though the mixture is coarser, owing to the 

 buffy subterminal rings on the hairs being longer. Sides 

 and under surface watched with dull clay-colour or j»ale buflfy. 

 Muzzle, ears, feet, and tail dark smoky brown. 



Skull a little longer than that of medius; muzzle more 

 parallel-sided; interorbital region broader; brain-case a 

 longer oval^ its ridges less strongly developed. Concavity of 

 anteorbital plate well marked. Palatal foramina long and 

 narrow. Bailee averaging rather smaller than in medius, 

 tliough both species vary in this respect. ]\lolar3 larger and 

 heavier, broader in proportion to the space between them. 



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



Head and body 144 mm.; tail 151; hind foot 33 ; ear 23. 



Skull : greatest length 37*5; condylo-incisive lengtii 37*8 

 zygomatic breadth 19 ; nasals 15 ; interorbital breadth 4*6 

 palatilar length 20 ; diastema 12*1 ; palatal foramina 8*8 

 upper molar series 7*7 ; breadth of palate between m^ 2*0. 



Type. Adult female. B.M. no. 12. 4. 3. 15. Original 

 number 95. Collected 27th December, 1911. 



" Water-rat ; found on river-banks ; a great swimmer.^' — 

 G. T. F. 



The species of the genus Dasymys are not very sharply 

 defined, but I cannot identify Mr. Fox's one with any pre- 

 viously described. The teeth are materially larger than in 

 the only known W.-African form, D. rufulus, Miller, and its 

 nearest ally would seem rather to be I), medius of Central 

 Africa, with which it is compared in the description above. 



Mr. Fox's observation that this animal is a water-rat is of 



