Xantholinus longiventris
This keyed to longiventris but it's always reassuring when the genitalia match as well. This one came to light in my garden.
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Xantholinus longiventris showing elytra and aedeagus (with outer casing first and then with outer parts removed to allow clearer view of internal sac), North Elmham (Norfolk, UK), 5th April 2023
This one was swept from grass tussocks, rush and rhododendron saplings along a path in a birch woodland with rhododendron understory.
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Xantholinus longiventris showing aedeagus internal sac, Ling Plantation, North Elmham (Norfolk, UK), 12th April 2022
This one was swept at the same place a couple of years later.
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Xantholinus longiventris showing pronotum and aedeagus (whole and internal sac), Ling Plantation, North Elmham (Norfolk, UK), 6th April 2024
These were in pitfall traps (in propylene glycol, so no live photos). I think all of these were female.
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Xantholinus longiventris showing pronotum, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024
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female Xantholinus longiventris showing head amd pronotum, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024
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female Xantholinus longiventris showing pronotum, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024
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female Xantholinus longiventris showing genitalia, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024
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female Xantholinus longiventris showing head, pronotum and elytra, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024
The previous ones were identified using Lott & Anderson (I may have also referred to Hackston) but the next one was the first one I identified using the new Duff volume. It was found in a vane trap in my garden.
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female Xantholinus longiventris showing head (from above and front), maxillary palp, pronotum and scutellum, North Elmham (Norfolk, UK), 10th May 2024