Acalyptrate flies (Diptera) from sifted materials in the Geneva Museum, Switzerland.

Species 132 of eleven acalyptrate families are recorded from the sifted materials in the Geneva Museum (2120 specimens in 556 vials). Flies were identified from 13 countries in the Palaearctic Region (almost all cantons of Switzerland, France, Czechoslovakia, Hungary, Spain, Italy, Yugoslavia, Greece, Cyprus, Morocco, Israel, Turkey and Iran). Species 58 were recorded as new for the fauna of Switzerland, 15 species for France and one to five species for Spain, Italy, Greece, Cyprus, Israel, Turkey and Iran. More extensive application of the sifting method for collecting dipterous flies is proposed. First of all the species of the family Sphaeroceridae are obtained by sifting and consequent funneling. Fifty sphaerocerid species are recorded from Switzerland (33 for the first time), i.e. this is a contribution also to the better knowledge of the Swiss sphaerocerids.