wing comments and description are
based.

Three general groups of the genus _Apodemus_ are presently known to
occur on the mainland of northeast Asia. One is the distinctive
_Apodemus agrarius_, lone representative of the subgenus _Apodemus_. The
others, both in the subgenus _Sylvaemus_ and closely resembling each
other, are represented by a small animal that is currently regarded as
conspecific with _Apodemus sylvaticus_ and a larger animal of which the
Korean mouse, _peninsulae_, is representative. The oldest trivial name
applied to the large _Sylvaemus_ is _major_ of Radde, 1862, in the
combination [_Mus sylvaticus_] vrt. _major_. This is, however, twice
preoccupied (see Ellerman and Morrison-Scott, 1951:566). The next
available name is _peninsulae_ of Thomas, 1907, which was applied to
mice from central and southern Korea (type from Mun'gyong, 110 mi. SE
Seoul, Korea), and was originally proposed as a subspecies of the
insular Japanese species, _Apodemus speciosus_. G. M. Allen (1940:949),
who recognized _peninsulae_ as a monotypic species, was the first
investigator to make the important distinction that it was not
conspecific with the Japanese _speciosus_, although Hollister (1913:1-2)
and Miller (1914:89) had previously used the combination _Apodemus
peninsulae_, evidently with the same thought in mind.

[Illustration: FIG. 1. Ventral views of skulls and left maxillary
tooth-rows of two species of the genus _Apodemus_.

_a._ _Apodemus flavicollis flavicollis_ (Melchior), Lolland, Denmark,
adult [Male], No. 141691 USNM, x2.

_b._ _Apodemus flavicollis flavicollis_ (Melchior), Mauseklippe,
Germany, young [Male], No. 112895 USNM, x10.

_c._ _Apodemus peninsulae peninsulae_ (Thomas), Central Nat'l Forest,
near Pup'yong-ni, 200 m., Korea, subadult [Female], No. 300650 USNM,
x10.

_d._ _Apodemus peninsulae peninsulae_ (Thomas), 6 mi. S Yongdongp'o,
Korea, adult [Male], No. 299554 USNM, x2.

In comparing the ventral views of skulls note especially the size and
location of incisive foramina and posterior palatine foramina as well as
the breadth of mesopterygoid fossae. In comparing the left maxillary
tooth-rows note especially the size of M3 and the reduced
posterointernal cusp on Ml in _A. peninsulae_.]

More recently, Ellerman (1949:32) and Ellerman and Morrison-Scott
(1951:566) have arranged _peninsulae_ as a subspecies of _Apodemus
flavicollis_ under the assumption that all the members of the subgenus
_Syl