Females are larger than males.
Their wing span is about 10.5 to 13.5 inches. Relatively little research has been conducted on this endemic Hawaiian bat and data regarding its habitat and population status are very limited. Most of the available documentation suggests that this elusive bat roosts among trees in areas near forests. It is not known at this time whether the bat prefers native vegetation over introduced species. It is a solitary bat that typically leaves its roost shortly before sunset and returns before sunrise.