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The hemlock woolly adelgid (Hemiptera Adelgidae Adelges tsugae Annand) poses a serious threat to hemlocks in eastern North America, and ongoing research is focused on the identification and development of biological controls to protect and manage hemlock resources. Three predators native to the Pacific Northwest of North America that have been the focus of much research are Leucopis argenticollis (Zetterstedt), Leucopis piniperda (Malloch) (Diptera Chamaemyiidae), and Laricobius nigrinus (Fender) (Coleoptera Derodontidae). This study a