Mystery Beetle

My thanks to Richard Jones @bugmanjones for identifying this little beetle that was feeding on a bracket fungus growing on a willow, in Grantchester meadows beside the river Cam near Cambridge last week. It's Diaperis boleti "Once exceedingly rare. Scarce, but spreading or increasing? Mostly E.Anglia and SE England", says Richard.

Colour scheme looks like a sexton beetle but too small (only 4-5mm) and no clubs on the tips of the antennae.

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