Cheilosia (Nigrocheilosia) barkalovi Stahls 1997

Stahls 1997. Revision of the Palaearctic bare-eyed and black-legged species of the genus Cheilosia Meigen (Diptera, Syrphidae). Acta Zoologica Fennica, 208, 3 December 1997: 1-74