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EN · flutter flies, trembling-wing flies, waving-wing flies
DE · Zitterfliegen
https://en.wikipedia.org/wiki/Pallopteridae Adults have been found on flowers and low-hanging branches in shady habits. Known larvae are phytophagous or carnivorous (some species preying on beetles of the families Cerambycidae and Scolytidae. One species is recorded as preying on larvae of the family Cecidomyiidae. Some have been found in flower buds and stems.