This small bat occurs in eastern North America. It has dark facial markings, ears, and wings, glossy yellow-brown dorsal fur, and hibernates in caves and similar sites.
It weighs 3.5–6 g, has a head-and-body length of 75–85 mm, and a wingspan of 210–250 mm. It has a black mask, ears, and wings, glossy yellow-brown dorsal fur, and gray-brown underparts.
It is nocturnal and eats insects. It uses caves, mines, and rock crevices as roosts and hibernates in winter.
An extinction-risk assessment has not been added yet.