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Ukraine, Rivne region, on August 3.
There are two assumptions and I don't know which one to lean towards:
Lucilia eximia ? Protophormia terraenovae ?

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or a Muscidae …. :)

Check the bend in wing venation !

Theo

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Hi Victor, yes Muscidae: this male's frons seems to be very narrow, colour blue, scutum slightly dusted and I think it is probably a Pyrellia rapax.

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Thank you very much Theo fnd Eric !
Apparently, I'm not learning to distinguish between Calliphoridae and Muscidae by wings without a visual image (Also among Muscidae, I saw a very similar representative:
Eudasyphora ...

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It's not an easy task to id these metallic flies and in many cases you will not be absolutely sure from photos.
As a broad rule the M vein of Callophoridae has a sharp bow while the Muscidae's is obtuse-angled.
To be sure with Pyrellia/Eudasyphora you will nee a good photo of the thorax and the anterior postsutural intra-alar bristle: Pyrellia's is absent, Eudasyphora present.
I can recommend a nice book of 2021 from Olga Sivell with a section look-alikes where you can see the differences of the metallic flies (Calliphoridae, Tachinidae, Muscidae):
https://www.royen...rhiniidae/

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Thanks for your reply, Eric! I'm afraid I just won't have time to figure it out. Now I'm just trying to upload all the photos I have from previous years - maybe someone will find it useful, there is just some uncertainty in the future.

Would it be correct in this case to sign Muscidae?

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Yes, it's surely Muscidae, subfamily Muscinae. The 2 possible candidates are Pyrellia rapax and Eudasyphora cyanicolor.

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Thank you, Eric !!!