430 Mr. O. Thomas on 



Dimensions of the type (measured in flesh) : — 



Head and body 134 mm. ; tail 144 ; hind foot 28 ; ear 18'3. 



Skull : greatest length 34 ; breadth of brain-case 13*4 ; 

 upper molar series 6. 



Bab. Mazeras, coast region of British E. Africa. Alt. 

 500'. 



Type. Old male. Original number 1238. Collected 

 10th July, 1910, by Robin Kemp, and presented by C. D. 

 Rudd, Esq. Five specimens examined. 



Compared with a series of A. d. maculosus from Voi, for 

 which the Museum is also indebted to Mr. Rudd's collector, 

 these specimens are much greyer, and are at once separable 

 by their brown ears, these being as strongly ochraceous in 

 maculosus as in the A. d. rosalia of German East Africa. 



Epimys delectorum, sp. n. 



A small soft-furred species, something like E. morio. 



Size about as in Apodemus sylvaticus. Fur very soft, fine 

 and silky; hairs of back about 9-10 mm. in length. General 

 colour above dull sepia- brown, heavily blackened on the 

 posterior back ; sides tending more towards mummy-brown ; 

 under surface soiled buffy, the basal three-fourths of the hairs 

 dark slaty, their tips and a fairly defined lateral line pinkish 

 buff. Face dark greyish brown, the muzzle and an ill-defined 

 orbital ring blackish. Ears large, dark brown. Hands and 

 feet brown on the metapodials, silvery white on the digits 

 and laterally. Tail almost naked, very finely scaled (16 rings 

 to the centimetre), dark brown above and below, indistinctly 

 marbled with lighter brown, its very sparse fine hairs brown 

 above, whitish below. 



Skull smooth, light and delicate, practically without ridges ; 

 supraorbital edges square, not beaded ; projection of zygo- 

 matic plate medium ; palatal foramina reaching back to the 

 level of the front of m 1 ; bulla? of medium size. 



Incisors narrow. Molars low-crowned and (in the single 

 specimen) peculiar for the duplication, complete or partial, 

 of the outer cusp of the first and second lamina of m x and of 

 the main lamina of w 2 , so that, viewed laterally, m 1 appears 

 to possess five outer cusps — three larger ones and two smaller 

 ones between them *. Lower molars (m x and m 2 ) each with a 

 well-marked supplementary cusp at the outer end of the main 

 transverse valley, and a median posterior supplementary 

 ledge. 



* Cusps 3 and 6 of m 1 and 6 of m 2 in the notation employed by 

 Mr. G. S. Miller. 



