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Dear Jorgen and Valery,

To my opinion it is without a doubt M. crassipennis. Both specimens have the dark bands on the posterior margin of the tergites. The fact that the polinosity on the tergites is somewhat different from typical M. crassipennis is to my opinion because the specimens probably got wet, perhaps inside the killingjar?
We only have four species here in northwest Europe and indeed M. crassipennis is the only one regularly found in the interior of the countries.
However, I doubt that these species are associated with Artemisia. Both M. crassipennis and M. omissa are most frequently (only?) found in Phragmites stands. Where M. omissa is mainly found in more salty biotopes, whereas M. crassipennis is more found in fresh water. In august this year I also found M. picta in large numbers on one of our Frisian Islands, all of them exclusively on another grass Elytrigia atherica, whereas I also swept pure stands of Artemisia maritima, which yielded none... I have a paper in preparation on the presumed ecology of M. picta, giving a key to the four species of the Netherlands as well as distribution keys. It will be published in June next year.

Cheers John