Celery Leaf Beetle Phaedon tumidulus

Apparently the commonest member of the genus here.

This was in a pitfall trap (in propylene glycol, so no live photos) set along a beetle bank in an area with lots of umbellifers (including Hogweed and Hemlock).

Celery Leaf Beetle Phaedon tumidulus showing metasternum, pronotal disc and pronotal fore margin, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024