Phratora laticollis

Apparently this species is primarily found on poplars, especially Aspen. This one was at a site where there's lots of Aspen, but this individual was found on another Poplar species, probably a hybrid (I had previously found Phratora vitellinae on Aspen there). I keyed it using Duff, arriving at Phratora laticollis before I checked the genitalia. Happily the aedeagus supported this identification.

male Phratora laticollis showing its head from in front, tarsal claw, hind tibia, apical sternites and aedeagus (side and flat views), Wendling Beck Environment Project (Norfolk, UK), 16th May 2025