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Northern Germany, Schleswig-Holstein, Bellin (east of Kiel), little place, where cut wood wait for removal, around with many old oaks; found at the low vegetation like Urtica sp., grass, Fallopia japonica; nearby a mixed forest (Douglasie, Oaks, Beeches) and a pasture.
First specimen at a leaf of Urtica sp., the second at a plant of Alliaria petiolata, 18th of May 2023, (Photos - kuv). Checking the WWW I only found one black hoverfly with such red/orange abdomen: Psarus abdominalis; but this shall be "disappeared" since 1995. Please help to get the ID.
Kuv

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first specimen 2nd picture:

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first specimen 3rd picture:

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first specimen 4th picture:

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first specimen 5th picture:

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Second specimen:

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Brachypalpoides lentus?

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Thank you very much, Eric |t:
Yes - reading the threads about Brachypalpoides lentus in the Diptera.info Forum - I think your idea is a very good choice.
Greetings Kuv