The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae).

Keys to adults and larvae of the genera of West Palaearctic nematine sawflies are presented. Species of some of the smaller genera are keyed, and their taxonomy, distribution, and host plants reviewed, with a geographic focus on north-western Europe, particularly Sweden. Lacourt, 2006 is a new junior subjective synonym of Latreille, 1810, resulting in the new combination (Lacourt, 2006) for the type species of . Ermolenko, 1960 is a new junior subjective synonym of (Serville, 1823). Lectotypes are designated for Fabricius, 1775, Mesoneura opaca var. nigerrima Enslin, 1914, Mesoneura opaca var. obscuriventris Enslin, 1914, Hartig, 1837, Hartig, 1840, Förster, 1854, Förster, 1854, and Platycampus luridiventris var. pleuritica Enslin, 1915. A phylogenetic analysis based on four genes (mitochondrial COI and nuclear NaK, POL2, and TPI) supports the current generic classification.