448 Mr. O. Thomas new Asiatic 



naked, greyish brown. Hands and feet dull whitish. Tail 

 rather longer than lioad and body, tliinly haired, brown 

 above, but little lighter below. Mammae apparently only 

 1 — 2 = 6, as in A.sylvaticiis, the anterior pectoral pair absent 

 in the two nursing females in the set. 



Skull quite like that of draco; the front edge of the zygo- 

 matic plate slightly concave; the postero-internal or ".r" 

 cusp of m^ and m^ better developed than in most of the 

 N.-(/hinese and Japanese mice recently assigned by me to 

 different subspecies of A. speciosus. 



Dimensions of the type (measured on skin) : — 



Head and body (probably stretched) 103 mm. ; tail 114 ; 

 hind foot (wet) 24 ; ear (wet) 16. 



Skull : tip of nasals to front corner of interparietal 25 ; 

 zygomatic breadth 14; nasals 11; palatilar length 12"5 ; 

 palatal foramina 5*6 ; diastema 8 ; length of upper molar 

 series 4*1. 



Hah. Mt. Arizan, Central Formosa. 



Type. Adult female. B.M. no. 8. 4. 1. 48. Collected 

 13th November, 1906, by Mr. Alan Owston's native collectors. 

 Three specimens examined. 



As a nameable form, and irrespective of the mammae, this 

 mouse is readily distinguishable by its much darker general 

 colour from its mainland neighbours, of which it is, perhaps, 

 an insular " saturate " representative. 



But some doubt is thrown on this view by the apparent 

 presence of only 1 — 2 = 6 mammae, the number characteristic 

 of the European and W. -Asiatic A. si/Ivaticus, while hitherto 

 all the far eastern members of the group have been found to 

 have 2 — 2 = 8, which I have therefore supposed to be charac- 

 teristic of them. All the Korean and Chinese examples of 

 A. speciosus have the latter number, as also has the Fo-kien 

 A. s. draco. The skull, however, is clearly that of the 

 speciosus rather than of the sylvaticus group. 



Evotomys frater, sp. n. 



A large dark-coloured species, much browner than the 

 only other Tbian-Shan species, E. centralis, Miller. 



Size fairly large. Fur soft, loose, not so long as in cen- 

 tralisy the hairs of the back about 13 mm. in length. General 

 colour above approaching " mummy-brown," with only 

 enough rufous suffusion to indicate that it is an Evotomys. 

 Head and sides rather clearer brown. Rump smoky grey, 

 almost blackish near the root of the tail. Under surface 

 unusually dark, little lighter than " hair-brown," not defined 

 on sides, the hairs slaty for four-fifths their length, with dull 



