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Thank you very much Katerina for your answer!

I just have 4 questions:

1 - Is the "dark antenae criterion" the only difference between S. dupliciseta and S. brachypterna?

2 - Is it a male or a female? How can you see that?

3 - As Jan said, this specie is not recorded from france (but is recorded from switzerland... the border is closed from my location). Is there any doubt for this identification?

4 - What is the reference book for the identification of european Heleomyzidae? Is there any online key or pdf available for everybody?

Regards,

Guillaume