_Specimens examined._--Total, 4: Chickaree Draw, Prater Canyon,
8200 ft., MV 7841/507, probably in the summer of 1935; Rock
Springs, 7400 ft., 69241, August 23, 1956, and 69249, August 18,
1956; Museum, Headquarters, 6950 ft., 69251, August 24, 1956.
An adult male (69241) was taken in a Japanese mist net stretched fifteen
feet across a dirt road where it entered the stand of pinyon and juniper
at the south edge of the burn on Wetherill Mesa between 7:20 and 8:30
p.m.; at the same place and time I captured five other bats of four
species: _Myotis thysanodes_, _Myotis subulatus_, _Eptesicus fuscus_,
and _Plecotus townsendii_. A piece of mist net attached to an aluminum
hoop-net two and one half feet in diameter was used to good advantage in
capturing bats rebounding from the larger mist net, and in frightening
bats into the larger net when they approached closely. An adult male
(69249) was shot at 7:20 p.m. while flying six to eight feet from the
ground between pinyon trees up to 20 feet high; the air temperature was
70 deg. F. A female (69251) was found seemingly exhausted on the floor in
the museum at Park Headquarters in the daytime, and was immature as
indicated by small size, open basicranial sutures, unworn teeth, weakly
ossified zygoma, and open epiphyseal sutures of phalanges.