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Another individual, but this photo was made in early spring. Melinda sp?

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I raise this topic, maybe it was overlooked due to the end of the year.

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why does (almost always) in posterior margin of the wing in Calliphoridae have that rough aspect?

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Gabor

My reading suggests that any greeny reflection on the abdomen makes it Bellardia, so I think this one is Bellardia.

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Thx Susan for your comment. I try to do some research on Bellardia in Hungary.

To me green abdomen with no uniformly green thorax can be Onesia, Bellardia or Melinda. Clearly this is not the most common Calliphorid in Hungary.

As for the question why Calliphorids have a rough posterior wing, the answer seems quite obvious. These flies are relatively large and there are no veins to strenghten the posterior margin opposed to the anterior margin, where the role of the costa is to protect the more vulnarable anterior margin agains wear.