344 Mr. G. E. H. Barrett-Hamilton on the 



Head and 



body. Tail, 



mm. mm. 



S , 12th April, 1898 55 70 



(Uusexed), 27th April, 1898 58 61 



showing that the length of the tail exceeds that of the body. 



The dimensions of an adult female, one of Pere David's 

 specimens from Tibet, and now in the Paris Museum, were 

 found by Mr. Oldfield Thomas to be : head and body 56"5, 

 tail 57, hind foot 14, ear 7*2. 



The subspecies was originally described by Milne-Edwards 

 from specimens collected by Pere David in the Province of 

 Se-tchuan *, in Eastern Tibet. 



4. Mus minutus ussuricus, subsp. n. 



The type specimen was collected by Messrs. Domes at 

 Ussuri, in the Coast Province of Eastern Siberia, and is 

 no. 91. 6. 29. 1 of the British Museum collection. In its 

 coloration it is far darker on the upper surface than Mus 

 minutus, and the red colour on the rump is far duller ; as in 

 minutus, the dark colour of the upper surface becomes lighter 

 on the flanks, but, unlike minutus, there is no distinct line of 

 demarcation and the white colour of the underside, instead of 

 being pure, is washed with dirty yellow. The specimen is 

 large and seems to about equal in size a house-mouse, Mus 

 musculus. 



The dimensions of the dried skin are as follows : — 



mm. 



Head and bodv 78 



Tail 62 



Hind foot 12 



The cranial and dental characters are not distinctive from 

 those of other subspecies. 



The description of Mus minutus flavus, as given by Kerr 

 ('Animal Kingdom,' p. 232, 1792), prevents me from iden- 

 tifying my new mouse with this form, which, according to 

 Kerr, u is elegantly yellowish coloured on the upper parts, 

 and pure white on the under parts of the body." He adds 

 that it " Inhabits Siberia. — This variety is exceedingly 

 beautiful." 



The subspeciflc identity of the mice to which the following- 

 names were applied must for the present remain uncertain, 



* At page 291 the province is called Se-tchuan ; under the plate it is 

 called Moupin. 



