136 MR. OLBFIELD THOMAS OX 



In all papers previous to this therefore* the name chevrieri 

 must be entirely withdrawn from the member of the speciosus 

 group to which it has been wrongly attached. 



With regard to fergussoni, more material from Kan-su is 

 needed before its characters can be elucidated ; but there is some 

 evidence that the northern specimens of chevrieri, e. g. those from 

 Wei-choe, have less fulvous suffusion on the hinder back than 

 the southern ones, the type oi fergussoni being completely without 

 it. For the present, therefore, we may provisionally call the 

 Kan-su form Apodemus chevrieri fergussoni^ with the Wei-choe 

 specimens as connecting intermediates. 



21. Apodemus speciosus peninsula Thos. 



cT . 2578, 2580. $ . 2579. Hwa-yin-san, 50 miles N.E. of 

 Chung-king. 3000'. 



f?. 2598, 2647, 2649, 2652, 2653, 2661. $. 2593, 2597, 

 2601, 2644, 2645, 2646, 2648, 2650, 2655, 2660. Wei-choe, 

 Si-ho R., W. Sze-chwan. 5900-7500'. 



A . speciosus group. Tail and ears comparatively long. Molars 

 more complicated ; m^ with antero-external secondary cusp ; 

 m^ with three internal projections, 



22. Apodemus speciosus orestes. 



Thos. Abstr. P.Z.S. 1911, p. 49 (Oct. 31). 



A. s. chevrieri M.-Edw., Thos. P.Z. S, 191 1 , p. 172 (in part.). 



c?. 2610, 2622, 2624, 2636, 2654. $, 2623, 2625, 2626, 

 2635. Wei-choe, R. Si-ho. 7000'-l 2,000'. 



As explained above, the common long-tailed Field-mouse of Sze- 

 chwan proves to have no claim to the name chevrieri, hitherto 

 supposed to be applicable to it, and we have now to consider 

 what it should be called. 



On laying out again the fine series received from Mr. Anderson, 

 w-e find, to start with, that the specimens from Mt. Omi are 

 uniformly dark-coloured and clearly form a race distinct from the 

 pale A . s. peninsular is. 



This may be called 



A. S. ORESTES. 



Size about as in A. s. peiiinsuke or rather larger. Tail longer 

 than head and body. Ears of medium size. Colour very dark, 

 the back (in summer specimens) slightly more rufous than 

 Ridgway's " sepia." Under svirface grey no. 7. 



Skull slenderly built, of medium size. 



Dimensions, taken in the flesh : — Extremes 



Tj-pe. of Omi series. 



Head and body 93 mm. 85 -98 mm. 



Tail 125 „ 102 -125 „ 



Hind foot 24 ., 22-5-25 „ 



Ear 16 „ 15-5- 18 „ 



* From BiU-rctt-Hamiltnti, P. Z. S. 1900, p. 418 onwards. 



