Abstract
AbstractAs part of a preimpoundment baseline study in the James Bay Hydroelectric Project in Northwestern Québec, systematic collections of aquatic insects were made in 1974 and 1975 in lakes and streams of the Rivière du Castor drainage. The aquatic Empididae are reported on here: they comprise 12 species, one of which is new (Hemerodromia fibrina n. sp.). Except for the boreal Metachela albipes, the fauna is remarkably temperate in character and composition. Emergence patterns are similar, though foreshortened, to those observed in southern Québec, and there are no bivoltine species. Most species are lotic and many thrive in fast waters (Neoplasm scapularis, Roederiodes recurvatus), but there is nevertheless a distinct lacustrine fauna (H. fibrina and perhaps also Chelifera rastrifera). The bog stations harbored only the widespread Chelifera palloris.
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