Abstract
While examining the collections of immature stages of Simuliidae made at Jasper, Alta., in 1932, by Mr. J. D. Gregson, Livestock Insect Laboratory, Kamloops, B.C., I recently found a female pupa of the rare and remarkable family commonly called “mountain midges”. The group consists of a single genus, Deuterophlebia Edwards (1922), in which four Asiatic and two North American species are recognized, although there are, also, a few records of unidentified larvae and pupae. Muttkowski (1927) first recorded the family on this continent, and Pennak (1945, 1951) and Wirth (1951) have described the two Nearctic species. Pennak (1945) has also summarized the published information on the distribution, habits, and morphology of the group.

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