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Twenty parasitic and hyperparasitic species were reared from Coleophora laricella (Hübner) from 95 locations in Montana, Idaho, and Washington. Spilochalcis albifrons (Walsh) and Dicladocerus sp. near westwoodii Westwood were the most abundant native species recovered. Agathis pumila (Ratzeburg), an introduced parasite, was recovered from 58% of the release sites sampled in 1970.