The genus Conotrachelus Dejean (Coleoptera, Curculionidae) in the north central United States, 19, no. 3

"The greater portion of the material included in this study has been taken from a thesis of the same title, submitted...for the degree of doctor of philosophy...University of Illinois, 1940. The original material has been revised, and several additions have been made."--Pref.Contribution from the Entomological laboratories of the University of Illinois, no. 223."Literature cited": p. 144-148