Confidence: It's likely to be this, but I can't be certain.
Notes: I have checked some books, but I am no beetle expert, so agreement from someone who is would be good. Not P. pomaceus as lacks femoral teeth (though the femora are strongly swollen), antennae red-brown under the scales, legs red-brown under the scales (femora darker), scales abundantly present on the underside. Size and position of the scobes rules out the very similar genus Polydrusus. Note that the name P. virideaeris was formerly applied to another species, now correctly named P. roboretanus, and confusion continues. P. viridearis is polyphagous, i.e. eats many plant species, and like several other Phyllobius species may eat young tree leaves.