Contents -- Abstract -- Introduction -- Sources of material and acknowledgements -- Morphology of adults -- Morphology of immature stages -- Classification and phylogeny -- Biology -- Distribution and zoogeography -- Review of Fennoscandian and other faunistic literature -- Collecting, preserving and identification -- Checklist of European Sepsidae -- List of Fennoscandian Sepsidae -- Key to the European genera of Sepsidae -- Subfamily Orygmatinae Frey, 1921 -- Genus Orygma Meigen, 1830 -- Subfamily Sepsinae Walker, 1833 -- Genus Ortalischema Frey, 1925 -- Genus Zuskamira Pont, 1987 -- Genus Themira Robineau-Desvoidy, 1830 -- Genus Susanomira Pont, 1987 -- Genus Saltella Robineau-Desvoidy, 1830 -- Genus Nemopoda Robineau-Desvoidy, 1830 -- Genus Meroplius Rondani, 1874 -- Genus Sepsis Fallen, 1810 -- Species from peripheral areas -- Catalogue -- Plates -- Literature -- Taxonomic index.