A new species of flat-headed mayflies (Heptageniidae) is described as Maccaffertium wudigeum McCafferty and Lenat, n. sp. The species is based on larvae taken from western North Carolina. It is morphologically most similar to some M. mediopunctatum (McDunnough) larvae, but does not possess any of the distinguishing markings associated with the latter and also differs from it in habitat.
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