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Hello,

I think it's a male Bithia ?
But I can't choose between Bithia demotica and Bithia modesta. Maybe even Bithia immaculata, I find that T2 is not shaded all the way to the posterior margin, but the dark spot is really very close to the posterior margin so I don't know if that matters


I have other pictures if needed


Jessica Joachim : France : Serviès : 81220 : 15/06/2024
Altitude : 295 m - Taille : 10 mm environ
Réf. : 353815

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If you take the alternative with excavation of T1+2 not extending to posterior margin you end up at a group of species with wider frons. As I interpret the keys it can't be Bithia immaculata because the abdomen is not immaculate. I can not distinguish demotica, modesta, and proletaria. Cerretti's key says distal half of scutellum yellow for modesta and scutellum almost entirely yellow for proletaria. Your fly might fit either alternative.

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Thank you so much. I said immaculata but I rather wanted to say acanthophora.

I didn't know Bithia proletaria. It's not noted from France, but from Italy, it's not very far.

What about the color of the scutellum of demotica ? Is this key accessible?

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Cerretti's book is I tachinidi della fauna italiana (Diptera Tachinidae).