We report the first record of the disk-winged bat Thyroptera discifera (Chi
roptera: Thyropteridae) found in Costa Rica and present observations on mor
phology and echolocation behavior of this poorly known species. Diet analys
is showed the presence of Lepidoptera scales and spider fragments in the ba
t's feces. Echolocation calls showed very low intensity and consisted of se
veral frequency-modulated harmonics. Behavior and echolocation calls, toget
her with data from fecal samples, suggest a gleaning insectivore lifestyle
for the species.