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Hello! I caught yesterday this fly in Hungary. I tried to key out, and I got Onesia. There’s Onesia sepulchralis, what can be excluded because the ia bristle before the suture. (I marked it with red in the 3. picture). I could exclude zumpti as well, because hairs on cheeks. Then, this just could be two species: austriaca and kowarzi. I read, that they can be distinguished by the face in side view. My key writes, that: “the forehead is forward one third of the width of the eyes” in kowarzi, and half in austriaca. About this, I would say, that this is austriaca. I marked it with red in the fourth picture, is that what the key says? Or did I mark something else? Could you help me please? Which species is this?

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External features are highly unreliable, in my experience, in Onesia.
Simply check the genitalia.

Theo

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Thank you! And how can I see the genitalia? Do I have to pull it with something from the abdomen? Or how? Could you please explain it to me? I haven’t checked genitalia so many times, and in general, I can’t find it.