New Syrphidae (Diptera) of North-eastern North America

BACKGROUND: This 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 Six of the new species have been recognised for decades and were treated by J. Richard Vockeroth in unpublished notes or by Thompson in his unpublished but widely distributed "A conspectus of the flower flies (Diptera: Syrphidae) of the Nearctic Region".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 INFORMATION: New species treated in this paper include: Anasimyiadiffusa Locke, Skevington and Vockeroth (Smooth-legged Swamp Fly), Anasimyiamatutina Locke, Skevington and Vockeroth (Small-spotted Swamp Fly), Brachyopacaesariata Moran and Skevington (Plain-winged Sapeater), Brachyopacummingi Moran and Skevington (Somber Sapeater), Hammerschmidtiasedmani Vockeroth, Moran and Skevington (Pale-bristled Logsitter), Microdon (Microdon) scauros Skevington and Locke (Big-footed Ant Fly), Mixogasterfattigi Locke, Skevington and Greene (Fattig's Ant Fly), Neoasciaguttata Skevington and Moran (Spotted Fen Fly), Orthonevrafeei Moran and Skevington (Fee's Mucksucker), Psilotaklymkoi Locke, Young and Skevington (Black Haireye) and Trichopsomyialitoralis Vockeroth and Young (Coastal Psyllid-killer). Common names follow the "Field Guide to the Flower Flies of Northeastern North America" (Skevington et al. 2019).