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BackgroundThe genus    Boletina    is a species rich group of fungus gnats. Members of the genus are mainly known from temperate, boreal and arctic biomes. Phylogeny of the genus is still poorly resolved, dozens of species are insufficiently described and undescribed species are often discovered, especially from samples taken from the boreal zone.New informationFour new species are described.    Boletina   valteri    Salmela sp.n. (Finland),    Boletina   kullervoi    Salmela sp.n. (Finland),    B.   hyperborea    Salmela sp.n. (Finland, Norway, Sweden, Canada) and    B.   nuortti    Salmela sp.n. (Finland).    Boletina   arctica    Holmgren is redescribed and reported for the first time from the Canadian high arctic zone.    Boletina   borealis    Zetterstedt and    B.   birulai    Lundström are reported for the first time from Canada.    Boletina   subnitidula    Sasakawa (syn. n.) is proposed as a junior synonym of    B.   pallidula    Edwards.

New and poorly known Holarctic species of Boletina Staeger, 1840 ( Diptera , Mycetophilidae )