EN
Balaustium murorum (Hermann, 1804) is redescribed. Characteristics of active postlarval forms and first characteristics of larvae, supplemented with data on biology of the species, are provided. Female of B. murorum, from which larvae were obtained by experimental rearing, has been designated as neotype. Key characters, hitherto used by different authors in order to distinguish between members of Balaustium are discussed. Seventeen species known from larvae are presently assigned to Balaustium, at the total number of 41 members of the genus known worldwide.