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I suppose that this female has an abnormal pattern on abdomen. Only this picture.
Straight pattern on tergite 2 and very thin on tergite 3 and only at edge in tergite 4.

If I remeber it was about 9-10mm. What genus is it?

Photo from Nattsjön, Ångermanland, Sweden 62.56N 17.36 E 13 june 2009

Thanks for your help in advance

Regards

Kurt Holmqvist

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Dasysyrphus venustus group

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Thanks for your help Lukasz

I found another picture of same female but do not know if it will help to get a sure species ID.
Kurt Holmqvist