Cheilosia occulta Barkalov 1988

Barkalov 1988. [Description of new species of the genus Cheilosia Meigen, 1822 (Diptera, Syrphidae) from Siberia and the Far East.] Novye i Maloizvestnye Vidy Fauny Sibiri, No. 20 1988: 102-108