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The Palaearctic species of the    Cheilosia   caerulescens    group (  Diptera  :   Syrphidae  ) are revised in this work. The species group belongs to the genus   Cheilosia   subgenus   Taeniocheilosia   Oldenberg. One new species is described from north Caucasus,   Cheilosia  ( Taeniocheilosia )  circassica   sp. n.    Cheilosia   primulae    Hering is established as a junior synonym of    Cheilosia   laeviventris    Loew. Four lectotype designations are made. The species of the    Cheilosia   caerulescens    group are redescribed and illustrated, and a table of diagnostic characters and an identification key to species are provided. MtDNA  COI  barcodes were generated for several specimens of   C.  ( T. )  caerulescens   Meigen and other   Cheilosia  ( Taeniocheilosia )  and    Cheilosia    s. str. taxa. Parsimony and maximum likelihood analyses did not place the morphologically similar    C.   hercyniae    Loew in the    C.   caerulescens    group but among other   Cheilosia  ( Taeniocheilosia )  taxa. The following eight taxa are included in the   Cheilosia  ( T. )  caerulescens   group of species:    Cheilosia   armeniaca    Stackelberg, 1960,    C.   caerulescens   caerulescens    (Meigen, 1822),    C.   caerulescens   calculosa    Skufjin, 1977,    C.   circassica    sp. n.,    C.   herculana    Brădescu, 1982,    C.   kerteszi    Szilády, 1938,    C.   laeviventris    Loew, 1857, and    C.   venosa    Loew, 1857.

Taxonomic review of the Palaearctic species of the Cheilosia caerulescens -group ( Diptera , Syrphidae )