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On August 13"'1999, we (RA and PC) captured in the attics of the church of Fully (Valais, Swiss Alps), a male lesser mouse-eared bat Myotis blythii (Vespertilionidae) carrying a ring (Museum of Natural History of Geneva, 3632). According to the record book of that institution, that male had been ringed at the same place by MD, on 18"'July 1966, along with 212 other mouse-eared bats taken from the same cluster. The individual was presumably a juvenile at its capture time as mouse-eared bat males aged more than one year rarely cluster with other individuals in colonies. To our knowledge, 33 years constitutes a record of longevity as regards European bats. The previous European records of longevity were a male greater horseshoe bat (Rhinolophus ferrumequinum) recaptured 30 years and 6 months after its initial ringing (Caubkre et al. 1984) and a 30 years old female long-eared bat (Plecotus auritus)(Leh-