| Summary: | Twenty nine species of Delphacidae are recorded from the Yukon Territory, Canada, two additional ones from an adjacent region of Northwest Territories, and one species from coastal Alaska. Two new genera are described: Aschedelphax Wilson and Yukonwdelphax Wilson. Six new species are described: Aschedelphax hochae Wilson, Delphacodes anufrievi Wilson, D. emelianovi Wilson, Javesella lla Wilson, Nothdelphaxglacia Wilson, and Yukonodelphax kendallae Wilson. Aschedelphax coloradensis (Beamer), Javesella kilmani (Van Duzee), Yukonodelphax pediforma (Beamer) and Y.stramineosa (Beamer) are new combinations. Kusnezoviella matisi Anufriev and Emeljanov is a junior synonym of K. macleani Wilson and Delphacodes hyalina Beamer is a junior synonym of Nothodelphax albocarinata (Stal). Of the 32 species included in the study, 18 have a Holarctic distribution - 10 of these are amphi-Beringian. The remaining 14 species are restricted to the Nearetic, 5 of these are recorded only from the Yukon and Northwest Territories.
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