 The diagnosis of this 'little brown bat' in the field is a forearm less than 32 mm and the fur a pale colour.The form of male genitalia will differentiate between other "Vespadulus", females are more difficult to distinguish when observed in the hand.The first description notes the greatest length of the skull as a range of 11.6 to 12.5 millimetres, giving a mean length of 12.1 mm, a feature the authors report as moderately long.