_Specimens examined_ (40).--NE 1/4 sec. 22, R. 1 E, T. 23 N, 1; NW 1/4
sec. 15, R. 5 E, T. 22 N, 1; 2 mi. N, 5 mi. W Ludlow, 4; 4 mi. S, 7 mi.
W Ladner, 19; 1/2 mi. W Reva, 2; SW 1/4 sec. 30, R. 7 E, T. 18 N, 3; 10
mi. S, 5 mi. W Reva, 10.
The prairie vole is the most abundant of the three microtines that are
known from Harding County. Our specimens came primarily from areas of
relatively dense grasses, such as those found in stream bottoms and
along fencerows. At two places, along a fencerow 1/2 mi. W Reva and in
Deer Draw, 10 mi. S and 5 mi. W Reva, _Microtus ochrogaster_ and the
meadow vole, _M. pennsylvanicus_, were trapped together.
Nine females taken late in May and in June carried an average of 4.4
(3-6) embryos that averaged 14.8 (4-25) in crown-rump length. Each of
two lactating females taken in late May had six placental scars. Testes
of seven adult males taken in May and June averaged 13.1 (12-16) in
length.
~Microtus pennsylvanicus insperatus~ (J. A. Allen, 1894)