jamaicensis has a head and body length of 35-55 mm, tail
length is 50-60 mm, and forearm lengths of about 27-41 mm. And
adult weights are about 4-10 grams. The long, soft fur is generally
gray, buff, yellowish, reddish, or deep chestnut.
is slim-bodied with long and slender wings, legs, and tail.
The large, separate ears are funnel shaped and are studded with
glandular papillae, similar to those found in the Old World
vespertilionid genus Kerivoula. Adult males also have
a large structure on the face or muzzle, called the "natalid
organ" which is composed of cells that show resemblance to sensory
cells, but may also have a glandular function. The muzzle is
elongate and lacks a nose-leaf. The broad lower lip is reflected
outward in the front and often has transverse grooves.
In general, N.
roosts with other bats in the darkest recesses of caves and
tunnels and can be distinguished from other species by its fluttering,
mothlike flight. They are insectivorous. They are sometimes
found in large groups, but also congregate in groups of fewer
than a dozen individuals.
is found in Jamaica.