Illustrated identification keys are given for the superfamilies/families of insect parasitoids and the subfamilies, genera, and species of Braconidae reared from species of Choristoneura Lederer in the Nearctic Region. Goniozus floridanus (Ashmead) (Chrysidoidea: Bethylidae) represents the third superfamily of Hymenoptera, and Colpoclypeus florus (Walker) (Hymenoptera: Eulophidae) is added to the list of Chalcidoidea recorded from Choristoneura. Fifty species of Braconidae in 18 genera and 9 subfamilies are recorded parasitizing 11 Choristoneura species; almost half belong to the Microgastrinae. Eight braconids (16%) were found for the first time as parasitoids of Choristoneura. The first host record is given for Oncophanes californicus (Ashmead) (Hormiinae). Known insect parasitoids of Choristoneura spp. in the Nearctic Region include 230 species in 106 genera, about 75% of which attack only 1 or 2 Choristoneura species each. An additional 36 species are considered incorrectly associated with Choristoneura, an error rate of 14%. The Banchinae (Ichneumonidae, especially Glypta Gravenhorst), Pimplinae (Ichneumonidae), and Microgastrinae (Braconidae) made up the greatest proportion of parasitoids. No parasitoids have yet been recorded from five Nearctic Choristoneura species.
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