71610 Japanese Mammals. 491 



crown and not very conspicuous. Area below eye broccoli- 

 brown, not blackish. Forearms and Iiands dark brown, a 

 small patch of bufFy-tipped hairs on the metacarpus. Hind 

 feet only blackish along the edges and on the digits, the 

 metatarsal hairs being largely tipped with dull bufFy. Tail 

 fairly simihu" to the body, but ratlier more tinged with clay- 

 colour. 



Skull distinguished from that of the other forms by the 

 nasals being abruptly and squarely truncated behind at a 

 level witli the tips of the premaxilhiry processes. 



Dimensions ot the type (measured in the tlesh) : — 



Head and body 382 mm. ; tail 280; hind foot 66. 



Skull : greatest length 66 ; basilar length 5i"7 ; length of 

 nasals 23 ; upper tooth-row without p^ 14"6. 



llah. Tosa, island of Sikokn. Alt. 300 m. 



Type. Female. B.M. no. 5. 3. 3. 17. Collected 4th 

 December, 1904, and presented by R. Gordon Smithy Esq. 

 Two specimens. 



Micromys geisha, sp. n. 



A delicate species, about equal in size to one of the smaller 

 forms of Mus syhaticus, though with more the build and look 

 of a large harve^'t-mouse. 



Size small, form slender. Fur soft and fine, without 

 spines, hair of back about 6 mm. in length. General colour 

 above pale reddish brown, rather warmer and redder than 

 Eidgway's " wood-brown," the head and forehead sliglitly 

 paler than the rump. Under surface white, sharply detined 

 laterally, the basal two thirds of the hairs dark slaty. Ears 

 rather short, pale brown, with a fine white edging. Outer 

 side of up])er arms and hips reddish grey ; inner sides, wn-ists, 

 hands, and feet white. Soles wholly naked, last foot-pad 

 elongated ; fifth hind toe (s. u.) reaching nearly to the end 

 of the first phalanx of the fourth. Tail of medium length, 

 thinly haired, coarsely scaled, the scales not alternated, but 

 forming distinct rings, averaging about twelve to the centi- 

 metre ; both scales and hairs brown above and white beneath, 

 but the contrast not conspicuous. Mamrate apparently 

 2 — 2 = 8, but this numeration is not absolutely certain. 



Skull very smooth, light, and delicate, rounded and without 

 ridges, the supraorbital e.lges hardly squared even in the 

 oldest example. Anteorbital plate straight-edged in front, 

 scarcely projected forwards in advance of the upper bridge. 

 Palatal foramina of medium length, not extending backwards 

 to the front of m\ Mesopterygoid fossa wide and rounded in 

 front, narrowing posteriorly. Bulluj uornuil. Molars small, 



33* 



