Oedemera lurida and Oedemera virescens are beetle species that cannot be distinguished from a photo.
While Oedemera lurida is, on average, smaller than Oedemera virescens, size is not typically used to distinguish the two.
The body of these insects is metallic pale-green, gray-green or brownish. 
Males of this species do not have the thickened hind femora of most males of the other Oedemera species, like for example Oedemera nobilis.

Landgoed Oostbroek, De Bilt, The Netherlands, 27 June 2023