Xantholinus linearis
I was pretty happy this was linearis without dissecting it, but always good to confirm it with an aedeagus, even if I did somehow manage to rupture the aedeagus when breaking the tip of the abdomen off.
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Xantholinus linearis showing pronotum (from above and side) and aedeagus (two views), North Elmham (Norfolk, UK), 9th August 2023
These were in pitfall traps (in propylene glycol, so no live photos). I'm not aware of identification characters in the female genitalia but this first one had a large sclerotised area that was not present on female Xantholinus longiventris that I've examined.
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female Xantholinus linearis showing pronotum and genitalia, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024
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Xantholinus linearis showing pronotum, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024