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Chloropidae: Aphanotrigonum trilineatum (Meigen, 1830), junior synonyms Oscinis annulifera Zetterstedt, 1848 and Aphanotrigonum beschovskii Dely-Draskovits, 1981. A very similar species is Aphanotrigonum nigripes (Zetterstedt, 1848) with very weak or missing brown stripes, mostly shorter wings and on average a smaller body size. A. trilineatum has phytosaprophagous larvae developing in Poaceae (grasses), including cereals. It is not rare all over Europe until Japan und Palaearctic China and occurs also in North America. On bogs and deforested areas within coniferous forests it is especially abundant (trials with yellow pan traps by M.v.T.). Flies are overwintering like several Elachiptera species. One feature of A. trilineatum and A. nigripes is singular among European chloropids: The lateral part of most abdominal tergites is separated from the dorsal part by a weak interruption. By this movability of the tergites the abdomen can become inflated after the ingestion of much food or during egg ripening. Thus, it is better protected by the lateral perpendicular parts of the tergites than in normal chloropid species. This morphological detail was not yet mentioned in the literature, e.g. in Nartshuk & Andersson (2012), Fauna ent. scand 43, or Kanmiya (1983), Mem. ent. Soc. Wash. 11.