Males have a peculiar glandular pouch on the throat.
Distribution in Texas. In Texas, it has been taken at localities near the Rio Grande in Val Verde, Brewster, and Presidio counties. Away from human habitations, this bat generally seeks diurnal refuge in crevices in rocks that form vertical or nearly vertical cliffs. The roost entrances typically are horizontally oriented, have moderately large openings, and face downward so they can be entered from below. In Capote Canyon in Presidio County, Texas, these bats were found utilizing a crevice formed by exfoliation of the nearly vertical rim rock.