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Peck, O. 1963, A catalogue of the Nearctic Chalcidoidea (Insecta; Hymenoptera). Canadian Entomologist (Supplement) 30:870-872
Puttler, B.; Thewke, S.E.; Warner, R.E. 1973, Bionomics of three Nearctic species, one new, of Hypera (Coleoptera: Curculionidae), and their parasites. Annals of the Entomological Society of America 66(6):1299-1306