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Northern Germany, Schleswig-Holstein, Halstenbek near Hamburg, found in area of tree nursery, earthwall (overgrown with small bushes like hazel, aspen, roses, sloes, brambles) under big oaks, first at a leaf of Prunus padus; later at a leaf of Populus tremulae; Outside Photo: kuv, 1st of June 2024.
Searching in the Diptera Gallery I think these insects could be Symmerus sp. (s. https://diptera.i...to_id=3814). Please help to get the ID.
Kuv