s area and southeastern Kansas. Activities of other
rodents may have confined the brush mouse ecologically to cliffs.
Although the grasslands are a barrier to further intrusion by the brush
mouse into Kansas, one cannot assume that they alone confined the brush
mouse to cliffs. Such an assumption would not explain its absence on
systems of cliffs similar to and near other systems of cliffs on which
it is found in the non-grassy Ozarkian habitats of Arkansas, as was
noticed by Black (1937). Such an assumption would not indicate why the
size of the cliff-systems is correlated with the absence or presence of
the brush mouse on the northeastern margin of its geographic range.

Parasites found on _P. b. attwateri_ include three individuals of the
laelapid mite, _Haemolaelaps glasgowi_. Two of these mites were removed
from a live mouse. Two larval Ixodid ticks, _Ixodes_ possibly _cookei_,
were removed from the pinnae of the ears of a specimen of _cansensis_
from the type locality, 4 mi. E Sedan, Chautauqua County. Four larval
Ixodid ticks, _Dermacentor_ possibly _variabilis_, were removed from the
pinnae of the ears of a live specimen of _cansensis_ from 3 mi. W Cedar
Vale, in Cowley County.

TABLE 2. STOMACH CONTENTS OF 38 BRUSH MICE FROM SOUTHEASTERN KANSAS IN
WINTER AND SPRING.

======================================================
Localities and | | |Acorn|
number of stomachs | Month |Empty| pulp|Seeds
-------------------+----------------+-----+-----+-----
2 mi. S Galena | | | |
10 | May, 1959 | 2 | 6 | 2
11 | December, 1959 | 1 | 10 | 0
3 | March, 1960 | 1 | 2 | 0
| | | |
4 mi. E Sedan | | | |
3 | December, 1959 | 3 | 0 | 0
2 | April, 1961 | 1 | 1 | 0
| | | |
3 mi. W Cedar Vale | | | |
6 | December, 1959 | 1 | 3 | 2
3 | December, 1960 | 0 | 3[B]| 0
-------------------+----------------+-----+-----+-----

[Footnote B: Judged to be acorn pulp or hickory nut pulp.]

Black (1937:195) and Cockrum (1952:180-181) reported stomach contents
of _P. b. attwateri_ from Cherokee County containing acorn pulp, seeds,
and insects. Analysis of 38 stomachs of the brush mouse (Table 2