Species Polydrusus formosus - Green Immigrant Leaf Weevil

Polydrusus sericeus Schaller 1783 non Goeze 1777

Polydrusus formosus (Mayer 1779)

5.1‒7 mm(1)

completely covered with metallic green scales except for brownish or yellowish-brown legs and conspicuous black linear grooves in elytra; eyes relatively large, positioned dorsolaterally, and angled slightly inward (i.e. anterior margin of eye is closer to the midline than posterior margin); least interocular distance less than or equal to width of eye; elytra almost parallel-sided, widest near the base

P. impressifrons has less conspicuous black lines in elytra, relatively small eyes positioned laterally and parallel to midline, least interocular distance 1.5‒2 times width of eye, and elytral margins slightly sinuate and widest near apex

native to Europe (widespread there)(2), adventive in NA (NF‒ON to PA‒IL) + UT & BC(3)(1)

primarily Yellow Birch (Betula alleghaniensis, Betulaceae)

member of the subg. Eudipnus C.G. Thomson 1859 that includes 22 spp. (all Palaearctic)