Protapion assimile
This is supposed to be a very commmon species so perhaps surprising I hadn't encountered one before this. I keyed it using Duff.
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Protapion assimile showing step between pronotum and elytra, base of elytra, hind tibia, fore coxa, mid and hind trochanters, pronotum, antennal bristles and relative lengths of basal antennal segments, Cooper Street, near Ash (Kent, UK), 17th July 2026