Revision of Nearctic mountain midges (Diptera: Deuterophlebiidae)

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Abstract
Previously undescribed character systems are evaluated and incorporated in a redescription of the genus Deuterophlebia Edwards (Diptera: Deuterophlebiidae). Nearctic species of mountain midges are revised to include six species, two of which are new. Deuterophlebia personata sp. nov. is widespread in the mountains of western North America, with northern populations apparently parthenogenetic. Deuterophlebia vernalis sp. nov. occurs only in south-central Washington state. A lectotype and paralectotype are designated for D. coloradensis Pennak, and distributional data are given for all North American species. Also provided are keys to larvae, pupae, and adults of Nearctic species, and a discussion of character variation in mountain midges, with particular reference to problematic populations from Oregon and California.