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Bekasovo-1 station, Naro-Fominsk district, Moscow region.
All of these were collected on flowers of Field Scabious (Knautia arvensis).
I understand it's all common species, yet I hope someone would be kind enough to confirm.

First fly, size 14-15mm, Eristalis pertinax (tenax)?

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Size 13mm, Eristalis arbustorum (interrupta)?

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Size 15mm, Helophilus pendulus?

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1. Eristalis pertinax female
2. Eristalis interrupta male
3. Helophilus affinis female (I think - keys out here, but I don't know this species)

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Thanks a lot Tony