208 Mr. 0. Ti 



10 mas on 



type, without postero-internal cusp (cusp 7 or x cusp), the 

 laminae simple, not corrugated. 



Type. H. margarettce (^Mus margarettce, Thos.). 



Otiier species : — H. pusillus {Mas margarettce pusillusj 

 Thos., 1893) and H. viinahassce, Thos. 



Tliis genus, whose peculiarities i)ave been already fully 

 detailed in the descriptions of the species, seems to bear in 

 Borneo to CJiiropodomys something of the same sort of rela- 

 tionship that in Africa the ThamnomysAWiQ mice do to true 

 Thamnomys ; but the difference between the two is greater 

 and more sharply defined, and the generic distinction of 

 Hceromys from Epimys indubitable. 



The asserted resemblance of the feet of //. minahassce to 

 those of "Mus,^^ as given in the original description, seems to 

 have been due to the specimen being a dried skin, so that 

 their structure could not be easily made out. They appear 

 to be much the same as in //. margarettce. 



Uromys ohiensis, sp. n. 



A medium-sized species, with white belly. 



Size rather less than in U. brwjnii. Fur thick, soft, and 

 woolly ; wool-hairs of back about 11 mm. in length. General 

 colour above dark clay-colour, more tawny on crown and 

 rump, clearer and more buffy on sides. Under surface and 

 inner sides of limbs pure wliite to the bases of the hairs, but 

 the white area somewiiat narrowed on the belly. Face 

 greyish brown. Ears short, naked, dull brown. Hands and 

 feet thinly haired, almost naked, white or flesh-coloured. 

 Tail rather long in proportion, dark brown, a few fine scattered 

 bristles upon it; rings of scales about 14 to the centimetre. 



Skull of about normal height; supraorbital edges little 

 developed. Palatal foiamina unusually prolonged backwards, 

 their posterior end almost level with the front of the anterior 

 root of m^. 



Dimensions of the type (measured in skin) : — 



Head and body 142 mm.; tail 154; hind foot (wet) 28; 

 ear (wet) 14. 



Skull ; nasals ll'S ; interorbital breadth 5*6; height from 

 supraorbital ledge to alveolus of m^ 9*3 ; palatilar length 16 ; 

 diastema 9*2; palatal foramina 6'1; length of upper molar 

 series 6*4. 



Jloh. Obi Island. 



Type. Adult female. B.M. no. 3. 4. ]0. 1. Collected 

 29th April, 1902, by Mr. Waterstradt. 



This species represents the farthest western extension of 



