1905. ] MAMMALS FROM JAPAN. 349 
3. 373, 374. 9. 375, 376. Kuma, Ehime Ken, Shikoku. 
1200’. 
3d. 459, 460, 461. 9. 452. Kawachi, Miyasaki Ken, Kiu- 
shiu. 1500’. 
3. 390, 391, 402, 411, 412, 425, 486, 487. 9. 393, 418, 419 
426, 433. Takamori, Kumamoto Ken, Kiushiu. 1850’. 
3. 483, 498, 499. 9. 484,491. Tano, Miyasaki Ken, Kiu- 
shiu. 500’. 
“*Common everywhere.’ 
Even with this fine series, combined with that sent by 
Mr. Gordon Smith, I am unable to trace completely the relation 
of the presence of spines in the fur to season and sex. Many 
specimens of each sex are spinous, many spineless, and in a general 
way it is clear that spines are a character of summer, while they 
are rarely or never present in the winter pelage. Two examples, 
however, killed in the middle of December have spines, and one 
from Shikoku, killed in February, so that there are evidently 
exceptions to the general rule. 
Young specimens, before the development of the rufous colour, 
are always spineless. 
The mammary formula in this species is 2—2=8. 
It appears probable that Temminck’s Mus argenteus, also 
described in the ‘ Fauna Japonica,’ was based on small spineless 
specimens of J/, speciosus. 
The following are the dimensions (in mm.) of a pair from the 
Izu peninsula :— 
3. Head and body 128; tail 112; hind foot 24; ear 16. 
2. 2 ” 115; ” 105; ” en; ” 15. 
30. MICROMYS SPECIOSUS AINU, subsp. n. 
3.10. Jozankei, near Sapporo, Hokkaido. 
@. 26. Shinshinotsu, near Sapporo, Hokkaido. 
©. 108,117. Aoyama, Hokkaido. 
As in true speciosus, but with rather longer feet and longer 
skull. 
General characters as in the J/. speciosus of Hondo, with the 
same dark fulvous colour blackened along the dorsal area and the 
same whitish underside. Fur similarly either spinous or spine- 
less. Hands and feet greyish white. Feet longer and heavier 
than in true speciosus. 
Skull rather narrower and more elongate than in true speciosus ; 
palatal foramina longer. 
Dimensions of the type, suSASEee in the flesh :— 
Head and body 118 mm.; tail 107; hind foot 27-5; ear 15. 
Skull—greatest length 31: basilar length 25; nasals 12:2; 
soy amare breadth 48: breadth of brain-case 12°8; palatilar 
length 14:4; diastema 9-5; palatal foramina 5°8; length of upper 
molar series 4°2. 
Hab. Hokkaido. Type from Aoyama. 
