Ears more than double the length of the head ; tragus oval-lanceolate : fur brownish gray on the upper parts; paler beneath.
Length of the head and body one inch ten lines; of the head eight lines; of the tail one inch eight lines; of the ears one inch five lines; of the tragus seven lines; breadth of the ears nine lines; of the tragus two lines and a half; length of the fore-arm one inch five lines; of the thumb two lines and three quarters: extent of wing ten inches two lines.
Head and face flattened; muzzle somewhat swollen about the nose; nostrils with their anterior and inner edges tumid, elongated posteriorly into a sort of cul de sac: eyes small: ears extremely large, more than twice the length of the head, oblong-oval, thin, and semi-transparent; the inner margin presenting a broad longitudinal fold, which doubles back nearly at right angles to the rest of the auricle and is ciliated with hair along its external and internal edges; near the base of this fold is a small projecting lobe, also ciliated; tragus long, oval-lanceolate, with the outer margin somewhat sinuous, the inner one straight: ears united over the head to the height of one line and a half; extending round at the base to the corners of the mouth: flying and interfemoral membranes broad and ample: tail longer than the fore-arm, the tip obtuse, protruding to the extent of three quarters of a line: forehead, and anterior surface of the connecting membrane of the ears, hairy; posterior surface of the same membrane naked. Fur long and silky, brownish gray on the upper parts, paler beneath; the hair every where dusky at the roots.
A common and generally diffused species, resorting principally to the roofs of houses and churches. Flight swifter than that of the Pipis-trelle. In the living animal the ears are generally curled, the bend being directed outwards, when at rest they are sometimes wholly concealed beneath the fore-arm, the tragus alone remaining erect.