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Spent some time reaching a conclusion here and am still not at all sure.
Looks like there are hairs on the underside of the costa between Sc and R1 and on the front tibia two pv bristles.
But these features are reported to be sometimes present in other Bellaria species as well.
The lower calypter has an infuscated border, didn't read about that feature before.
So I guess to remove all doubts a genital dissection has to take place.

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this one is strange. I don't know why the parafacialia are golden as they should be whitish. A dorsal photo would be nice since it is odd. However, keying it as a Bellardia leads us to either pandia or viarum. I lean more to viarum with the lower calypter being infuscated. Honestly, i can't see hairs on the costa. The photo is not so good but they should be obvious like Onesia. Could you get a pin and pull out the cerci/surstyli?

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Yes, the parafacials are really golden:


Hopefully, tomorrow I can take photos with better optics and try to dissect the genitalia.

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Hello Carnifex, that is definitely golden. I don't know why because, as a Bellardia, it keys to pandia/viarum. Anyway, genitalia are much easier with Bellardia. We don't need a dissection. Just a dorsal view of cerci/surstyli.

I started studying diptera with a cheap led microscope and i couldn't dissect under that lens. I just used reading glasses to see and a fine needle to tease or pry out the cerci/sursty;i. It doesn't work with Pollenia but Bellardia are quite different, so a simple view will make determination a breeze. You may be correct with pandia but it looks strange. I lean more to viarum despite the pv on t1. Calliphoridae can be difficult.

Best wishes,
John

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So, here there are the first pictures, hope they will suffice:

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Hello Carnifex,

The cerci/surstyli do not match any Bellardia.

so i suspected Onesia because of the golden parafacialia and the wing vein. I also think that the hairs on the lower calypter look more like Onesia. I see a strong v bristle on t2 and the anterior spiracle is dark brown.

So Onesia austriaca male is your best bet because of the large mouse-ear surstyli (similar to Melinda viridicyanaea in lateral view). A good lateral view of the aedeagus can confirm it without doubt.

Best wishes,
John

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I left the sample at work, so I can not make further pictures right now, but hopefully this one is sufficient:

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well i forgot that i have a male specimen. sorry. My Wife just told me that i have one and she is right. I also have a lateral of the cerci/surstyli. I am comfortable naming it Onesia austriaca male. I should've just mentioned Onesia to begin with. I am just really mentally tired lately.

Best wishes,
John

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Thank you so much John, that this guy finally got his name.
You seem to be really a great person!

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Hello Lorin,

I'm happy that you have an id. I remember that i found a male last year and i thought it was a Bellardia in the field. I was surprised to see the golden parafacialia. I realized that it was Onesia. Onesia can be quite variable. The abdomen ranges from green and greenish blue to green and bronze. I also found a very dark female last year. Almost completely black. The ovipositor revealed O. austriaca so i was surprised. I think that the original description of O. austriaca was based on a dark specimen. So try to keep this in mind when you are in the field.

you can download a copy of the revision of Onesia:
https://www.zobodat.at/pdf/Beitraege-zur-Entomologie_14_0915-0938.pdf

Also keep in mind that you should have O. zumpti in your area. I don't think that it is around Berlin but it should be around Vienna. O. zumpti looks similar to austriaca but the large surstyli of austriaca makes it easy to separate them.

I try to be a good person. I think that i am sometimes rude and i don't intend to be rude. Thank you for the compliment.

I think that you are also a good person and a good dipterist :)
I will help you with some keys to Calliphoridae. I'll send a pm soon.

Best wishes,
John

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The terrae typicae for O. austriaca & O. kowarzi are both from Vienna, close to the district where I live, and O. zumpti from the surroundings of the city. So they all should (hopefully) still be here to be found by me :)