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Hi,
Chris Raper thankfully provided the genus ID, and I tried to key it further. The head is not in focus in any shot, but tergites and legs might provide crucial characters. I went backwards and tried to exclude as many species as possible - and now am left with M. grisea and M. tenebricosa (but might have overseen something). The bristles on the mid tibia are well visible, but I am unsure about their exact position.

So, if the character combination:
"1 ad on mid tibia + tergite 3 with complete row of marginal bristles"
vs.
"mid tibia with 2 - 5 ad. + tergite 3 with 2 - 4 dorsal marginal bristles"
can be resolved, a species ID might be possible.

Observed in a garden in Vienna End of April (early date should also excxlude some)




enlarged image: