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Good evening,

Could this be some sort of Agromyzidae ?
It was ovipositioning ?? on Allium ursinum last week, near Heerlen.

Ben

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Yes, that is an agromyzid. I will see what I can find on the basis of the host plant.

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Thanks for the confirmation, I looked at the site of Willem N. Ellis and I saw four possibilities for Allium :

Chromatomyia horticola, Napomyza gymnostoma, Liriomyza cepae and
Liriomyza nietzkei.
I saw some pictures of other Liriomyza sp. that looked a little bit like the fly I saw.

Ben