nced no gross
reproductive activity. A male obtained May 29 had testes that measured
4.

Ectoparasites obtained from this species include chiggers,
_Leptotrombidium myotis_ (Ewing), a tick, _Ornithodoros kelleyi_ Cooley
and Kohls, fleas, _Myodopsylla gentilis_ Jordan and Rothschild and _M.
insignis_ (Rothschild), and an unidentified species of mite.

~Myotis volans interior~ Miller, 1914

Long-legged Myotis

_Specimens examined_ (43).--2 mi. N, 5 mi. W Ludlow, 4; NW 1/4 sec. 15,
R. 5 E, T. 22 N, 12; 10 mi. S, 5 mi. W Reva, 27.

The long-legged myotis is one of the commonest bats of the wooded
buttes, accounting for almost half of all chiropterans taken in these
areas. Most of our specimens were shot as they foraged among trees and
over water in the evening; a few were captured in mist nets.

Uteri of eight females obtained in the period May 23 to 31 were
enlarged; two females collected on June 29 carried single embryos that
measured 20 and 22. A lactating female was taken on August 3, but three
other adult females taken early in the same month evidenced no
reproductive activity. Testes measured 2 to 4 in three May-taken males
and 4 in each of two from June.

Two males obtained June 16 and 23 were molting as evidenced by new hairs
under the old pelage over much of the body.

_Myotis volans_ that we examined for ectoparasites harbored chiggers,
_Leptotrombidium myotis_ (Ewing), and fleas, _Myodopsylla gentilis_
Jordan and Rothschild.

~Lasionycteris noctivagans~ (LeConte, 1831)

Silver-haired Bat

A single female, which contained two embryos that measured 4, represents
the only record of a silver-haired bat from Harding County. This
specimen was shot at dusk on June 1, 1968, as it foraged over a small
pond in Deer Draw of the Slim Buttes (10 mi. S and 5 mi. W Reva).
Several other bats believed to be of this species were seen at the same
place that evening. We initially assumed that these were late migrants,
but recent findings indicate that this species is a common summer
inhabitant of the Long Pine Hills in adjacent Carter County, Montana,
and likely, therefore, also a resident in favored sites in Harding
County.

~Eptesicus fuscus pallidus~ Young, 1908

Big Brown Bat

_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 individ