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. 



c?. 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: — 



5 (Type) Head and body 80 ; tail 80 ; hind foot 19 ; ear 15. 



6 „ „ 77; „ 83; „ 19; „ 14. 



? „ „ 78; „ 74; „ 19; „ 13. 



Skull of type — greatest length 24 mm., length of upper molar 

 seizes 3" 6. 



T^Jpe. Male. B.M. No. 6.1.4.385. Original number 611. 

 Collected 10 July, 1905. 



These insular examples of the common geisha-Ynouae are 5- 

 15 mm. less in the head and body measurement, and 5-20 less 

 in the tail, than specimens from the mainland, but are like the 

 latter in all other I'espects. 



6. Lepus brachyurus okiexsis, subsp, n. 



S . 609 {yg.). $ . 604, 608 {yg.). Dogo Island. 100'. 



Size and other essential characters as in true brachytcrus, 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 bufty 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 l:)rown. Ears 

 with the proectote * deep black, inconspicuously fringed with 

 buffy ; metentote blackish proximally, brownish buffy terminall}^, 

 outer fringe narrow, dull bufiy, inconspicuous ; metectote brown 

 proximally, the terminal half -inch black. Sides little lighter than 

 back. Interramia dull whitish, reduced in size by the extension 

 of the black chin-patch. Collar deep bistre-brown. Belly dull 

 whitish. Limbs colourevd like back, the long hairs of the feet 



* Every mammalogist in describing specimens has felt the need for names to 

 characterise the diiferent 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 eutote, 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. Zool. See— 1905, Vol. II. No. XXY. 25 



