BIOLOGY AND IMMATURE STAGES OF SNAIL-KILLING FLIES BELONGING TO THE GENUS TETANOCERA (INSECTA, DIPTERA, SCIOMYZIDAE) .2. LIFE-HISTORIES OF PREDATORS OF SNAILS OF THE FAMILY SUCCINEIDAE

Information on the life histories and larval feeding habits of four Ne arctic species of Tetanocera that prey on snails belonging to the pulm onate snail family Succineidae are presented. The four species are qui te prey-specific, as larvae of Tetanocera melanostigma Steyskal prey o n species of Succinea, those of T. oxia Steyskal and T, spirifera Mela nder attack snails of the genus Catinella, and larvae of T. rotundicor nis Loew are associated with the genus Oxyloma. All four species are m ultivoltine and occur in marshy or swampy habitats containing large po pulations of succineid snails.