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Okay, it is Stratiomys. The combination of the broad abdomen, shape of the antenna (club-shaped without terminal arista) and the presence of two strong spines on the scutellum virtually make it impossible for it to be something else. About 26 species in North America (in contrast to the meager four we have in the Netherlands...) make it difficult for me to say which one. The very conspicuous white hairs on the face make me wonder if it might be S. barbata ('barbata' is 'bearded') but you will need to get confirmation for that.