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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