ser·o·tine 
(sĕrə-tĭn, -tīn′)
(sĕrə-tĭn, -tīn′)n.
Any of a several bats of the genus Eptesicus, especially E. serotinus, of Europe, Asia, and the Middle East.
[From New Latin sērōtinus, specific epithet, from Latin, coming late (from its habit of appearing late in the evening); see SEROTINOUS.]