Reference:
SLEEPER, Elbert L. Notes on North American Species of Polydrusus Germar (Coleoptera: Curculionidae, Brachyderinae): 17. A Contribution to the Knowledge of the Curculionoidea. 1957.URL:
https://kb.osu.edu/bitstream/handle/1811/4435/V57N03_129.pdfReferences
1 Nederlands Soortenregister