Melangyna labiatarum (Verall, 1901) / compositarum (Verall, 1873)

Recent authors (e.g., Bot & van de Meutter 2019; Speight 2020) regard M. labiatarum as a synonym of M. compositarum . We agree that it is difficult to distinguish these taxa using existing keys (e.g., Stubbs & Falk 2002; van der Goot 1981; Coe 1953), but as neither a revision nor a formal synonymisation has been published, we keep both names in the list.