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The biology of the Trigonalyidae (Hymenoptera) is reviewed, with emphasis on adult behaviour. New observations on the vespine parasitoid Bareogonalos canadensis (Harrington) are presented, including oviposition behaviour in Douglas-fir foliage and overwintering in the egg stage. Potential use of Bareogonalos spp. in biological control of vespines is discussed.
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