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Published online by Cambridge University Press: 31 May 2012
Swammerdami beirnei n. sp. (Lepidoptera: Yponomeutidae) is described from Vancouver district, British Columbia, and distinguished from the European species, S. pyrella (De Villers) and the North American species S. heroldella Hübner = syn. S. castaneae Busck, also = syn. S. cuprescens Braun by Duckworth (1965). Some biological aspects of the species are discussed.