Review of the Eptesicus brasiliensis Complex in Middle America with the Description of a New Subspecies from Costa Rica

Study of the types of Vesperus propinquus Peters and Vesperus (Marsipolaemus) albigularis Peters, both of which are allegedly from Central America and currently referred to the genus Eptesicus, reveals that both are representatives of previously named Old World species. V. propinquus is a synonym of Eptesicus nilssonii, and V. albigularis is a synonym of Vespertilio murinus. Eptesicus gaumeri (J. A. Allen) is considered the valid name for the lowlands population of small short-haired Eptesicus in Middle America. A population of somewhat larger short-haired Eptesicus in Costa Rica and western Panamá is described as new. The small long-haired Eptesicus occupying the highlands of Middle America, described and named Eptesicus chirquinus by Thomas, appears to be identical with Eptesicus andinus J. A. Allen from the highlands of Colombia. A synoptic key to New World Eptesicus is presented.