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Thank you Tony!
Obviously Meromyza is not easy:
https://diptera.info/forum/viewthread.php?thread_id=102909
According to L.R.Rockwood, S.Zimmermann et T.R.Chamberlin, 1947, sited and shown in
http://aramel.free.fr/INSECTES15-90'.shtml
it should at least not be M. saltatrix but rather M. pratorum.
I don't know how many other Meromyza look similar so I will write Meromyza species.
Regards
Lars