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Hello,
4 of these tiny flies were found in a rearing box containing galls on Asparagus acutiformis (supposed to be caused by Dasineura asparagi).

H. Dumas : France : La Ciotat : 13600 : 12/04/2021
Altitude : NR - Taille : 1 mm
Réf. : 279271

We searched in Agromyziidae and the closest genus we found were Phytomyza/Napomyza, but wing venation doesn't fit exactly.
So your opinion is wellcome

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Should be Ptochomyza asparagi based on host, appearance, size, and range. A similar and slightly larger species is found in southeastern Europe.

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I checked again and P. asparagivora reaches at least as far north and west as Italy, so Ptochomyza sp.

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Many thanks John!
I read in
Lonsdale, O. (2015). A new Afrotropical species of Phytomyza in the subgenus Ptochomyza (Diptera: Agromyzidae). African Invertebrates, 56(3), 637-643.
(here):
Phytomyza asparagi can be differentiated by usually having only a single notopleural seta medially on the notopleuron, the acrostichal setulae are usually in two rows, the pleuron is yellow with two spots on the katepisternum and meron, and the phallus is a simple membranous tube with a shorter distiphallus than that seen in the new species. Phytomyza asparagivora has an arista similar to the new species and the two notopleural setae are positioned posteriorly...
The only feature I'm able to check is the number of notopleural setae: I see only one, and it's in the middle of the notopleuron.
So is Phytomyza asparagi more likely?

I add a dorsal view for the three characteristic [of Ptochomyza] brown-to-black stripes that do not reach the posterior margin of the scutum ibid.

H. Dumas : France : La Ciotat : 13600 : 12/04/2021
Altitude : NR - Taille : 1 mm
Réf. : 279346

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If there is only one notopleura seta, it should be P. asparagi.

P. asparagi also has straighter M vein, longer and thinner arista, and longer and hairier first flagellomere than P. asparagivora. Your fly probably has the straight M vein. I can not judge the other differences.

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Indeed M vein is straight. I can't appreciate either the other features unfortunatly.
Many thanks again for your help John!

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Agromyzidae: Ptochomyza asparagi Hering, 1942 confirmed. Compare my text for the sibling species asparagivora: https://diptera.info/forum/viewthread.php?forum_id=5&thread_id=108885 . This species was first detected as leaf mine in a bunch of flowers during a congress in China.

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Many thanks von Tschirnhaus for your confirmation and informations.