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Hell,

[Click on the picture to get a better resolution and click again to come back.]

Pierre Duhem : France : Bonneval-sur-Arc : 73480 : 08/08/2019
Altitude : 2169 m - Taille : 7-8 mm
Réf. : 240800

This is already relatively late in the French Alps (2200 m asl).
The fore tibia shows this is the genus Dilophus. The wings are clear, with a dark mark at the spot of the pterostigma. There are white hairs on the fore leg.

And on the mid and back legs :

Pierre Duhem : France : Bonneval-sur-Arc : 73480 : 08/08/2019
Altitude : 2169 m - Taille : 7-8 mm
Réf. : 240802


Does this ring a bell for some of you?
Thanks in advance.