Abstract
The bat fauna of Tsushima, north of Nagasaki in Japan, was investigated from 2003 to 2006. We located 26 artificial underground structures and inspected them for bat presence. A total of 267 individuals representing six species and two families were captured (Rhinolophidae: Rhinolophus cornutus, Rhinolophus ferrumequinum; Vespertilionidae: Miniopterus fuliginosus, Myotis macrodactylus, Myotis formosus, and Murina ussuriensis). The four individuals of Myotis formosus were the first records of this species for 38 years.