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John, this will be H. palustris. Based on the literature that I have the most obvious difference between oscillans and palustris is that in the former species the antennae attach to the head around or below the verical axis of the eye, whereas in the later it is clearly attached to above the axis.

Oscillans should also live in dry sand habitats, wheras palustris lives in marshy areas. Oscillans is rare and local in Hungary and palustris should be common in the lowland marsh habitats. So palustris it will be.