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I figured out this year that M. loewi is assoziated with Alnus and Fraxinus dominated swamp forests in my region. In May the species is easy to find on stands of Cardamine amara, later on other flowers as well. All sites were characteristic for the sciomyzids Antichaeta atriseta and A. obliviosa which I was originally hunting for.
Unfortunately I collected no additional material and specimens in alcohol are for GBOL project. But now you might look out for it on the right place next saison yourself.
Regards
Piet