Cladius compressicornis

Formerly known as Priophorus pallipes (and called this in the RES key) and more recently still sometimes treated as a member of the genus Priophorus (e.g. Lacourt has it as Priophorus compressicornis).

This came to light. It keyed fairly straightforwardly although it was quite hard to see the details of the frons.

male Cladius compressicornis showing antennae (whole from below, A3 from below and A3 from side), wings, basal tergites, hind tibial spurs, ridge between median fovea and frontal basin (looking down and looking up) and aedeagus, North Elmham (Norfolk, UK), 2nd September 2024