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C.W. O'Brien. 1997.
A catalog of the Coleoptera of America North of Mexico. Family: Curculionidae, Subfamilies: Acicnemidinae, Cossoninae, Rhytirrhininae, Molytinae, Petalochilinae, Trypetidinae, Dryophthorinae, Tachygoninae, Thecesterninae.
United States Department of Agriculture. Agriculture Handbook. No 529-143g. 60 p.