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BackgroundThis paper describes 11 of 18 new species recognised in the recent book, "Field Guide to the Flower Flies of Northeastern North America". Four species are omitted as they need to be described in the context of a revision (three    Cheilosia    and a    Palpada    species) and three other species (one    Neoascia    and two    Xylota   ) will be described by F. Christian Thompson in a planned publication. Six of the new species have been recognised for decades and were treated by J. Richard Vockeroth in unpublished notes or by Thompson in his unpublished but widely distributed "A conspectus of the flower flies (  Diptera  :   Syrphidae  ) of the Nearctic Region". Five of the 11 species were discovered during the preparation of the Field Guide. Eight of the 11 have DNA barcodes available that support the morphology.New informationNew species treated in this paper include:    Anasimyia   diffusa    Locke, Skevington and Vockeroth (Smooth-legged Swamp Fly),    Anasimyia   matutina    Locke, Skevington and Vockeroth (Small-spotted Swamp Fly),    Brachyopa   caesariata    Moran and Skevington (Plain-winged Sapeater),    Brachyopa   cummingi    Moran and Skevington (Somber Sapeater),    Hammerschmidtia   sedmani    Vockeroth, Moran and Skevington (Pale-bristled Logsitter),   Microdon  ( Microdon )  scauros   Skevington and Locke (Big-footed Ant Fly),    Mixogaster   fattigi    Locke, Skevington and Greene (Fattig's Ant Fly),    Neoascia   guttata    Skevington and Moran (Spotted Fen Fly),    Orthonevra   feei    Moran and Skevington (Fee's Mucksucker),    Psilota   klymkoi    Locke, Young and Skevington (Black Haireye) and    Trichopsomyia   litoralis    Vockeroth and Young (Coastal Psyllid-killer). Common names follow the "Field Guide to the Flower Flies of Northeastern North America" ( Skevington et al. 2019 ).

New Syrphidae ( Diptera ) of North-eastern North America