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Heinrich (1956) records four species of Dioryctria from Canada. Material in the Canadian National Collection includes eight species from Canada, two of them new. Also, one of the species recorded by Heinrich was in my opinion misidentified by him. In this paper I describe the new species, and give locality records and photographs of the other Canadian species, notes on taxonomy and host associations, and a key to the Canadian species.
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Eugene Munroe (1959) studied this question.
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