1905. ] MAMMALS FROM JAPAN. 359 
Type. Young adult male. B.M. No. 6.1.4.378. Original 
number 583. Collected 30 June, 1905. 
This insular form of the common Japanese Field-Mouse is 
readily recognisable by its much shorter tail, this organ in true 
speciosus being rarely less than 100 mm. in length. 
5, MICROMYS GEISHA CELATUS, subsp. n. 
3. 598,611, @. 581, 606. Interior of Dogo Island. 100". 
Average size distinctly smaller than in mainland geisha, and 
the tail proportionally short. Fur fine and close; hairs of back 
about 6-7 mm. in length. Colour as in true geisha. 
Dimensions (in mm.) of three specimens, measured in the flesh :— 
3 (Type) Head and body 80; tail 80; hind foot 19; ear 15. 
Eeenee im iy? OOF Rs Oey wae 
OP ier 5 Se ES aN se TOS a acmlicte 
Skull of type—greatest length 24 mm., length of upper molar 
series 3°6. 
Type. Male. B.M. No. 6.1.4.385, Original number 611 
Collected 10 July, 1905. 
These insular examples of the common geisha-mouse are 5— 
15 mm. less in the head and body measurement, and 5-20 less 
in the taiJ, than specimens from the mainland, but are like the 
latter in all other respects. 
6. LEPUS BRACHYURUS OKIENSIS, subsp, n. 
3. 609 (yg.). 2. 604, 608 (yg.). Dogo Island, 100’, 
Size and other essential characters as in true brachyurus, but 
the colour heavily blackened throughout, more or less melanistic. 
Of the type, the only adult, the general colour above is uniform 
bistre-brown, the ordinary subterminal buffy rings on the hairs 
being either absent or much reduced. Central area of face and 
crown similar to back, as are the cheeks; a lighter line running 
from the whiskers past the eyes to the ears. Nape brown. Ears 
with the proectote* deep black, inconspicuously fringed with 
buffy ; metentote blackish proximally, brownish buffy terminally, 
outer fringe narrow, dull buffy, inconspicuous ; metectote brown 
proximally, the terminal half-inch black. Sides little hghter than 
back. Interramia dull whitish, reduced in size by the extension 
of the black chin-patch. Collar deep bistre-brown. Belly dull 
whitish. Limbs coloured like back, the long hairs of the feet 
* Hvery mammalogist in describing specimens has felt the need for names to 
characterise the different parts of the ear when folded, as in repose. The anterior 
third and posterior two-thirds of the outer surface, and the same of the inner, make 
four areas always distinguished from each other by colour or degree of hairiness, and 
constantly have to be described. If, therefore, the whole outer surface of the ear be 
called the ectote, we may call its anterior part the proectote and the posterior the 
metectote. Similarly the inner surface would be the entote, its anterior part the 
proentote and the posterior part the metentote. In ordinary specimens, with 
the ears folded back, it is the proectote and the metentote which are visible and 
characteristically coloured, while the metectote and proentote are commonly more 
or less naked and colourless. 
Proc. Zoou, Soc.—1905, Vou. Ll. No. XXV., 25 
5 
