_Specimens examined_ (11).--NW 1/4 sec. 15, R. 5 E, T. 22 N, 3; 7 mi. N,
2 mi. W Camp Crook, 3300 ft., 2; 10 mi. S, 5 mi. W Reva, 6.
The big brown bat is a common inhabitant of the Slim Buttes and North
Cave Hills, where individuals were shot or netted as they foraged over
water or among trees late in the evening.
Two May-taken females had enlarged uteri and one taken on July 8 was
lactating. The testes of a May-taken male measured 5, whereas those of
one obtained in early July measured 9. One of two males shot on August 4
was a young of the year; the other, an adult, was in fresh pelage as was
an adult male shot on July 8. The July-taken lactating female and three
June-taken specimens were in old pelage. Several specimens were
parasitized on the ears by chiggers, _Leptotrombidium myotis_ (Ewing).
~Lasiurus cinereus cinereus~ (Palisot de Beauvois, 1796)