Pipiza nielseni Violovitsh 1985

Violovitsh 1985. [New species of the genus Pipiza Flln. (Diptera, Syrphidae) of the Palaearctic fauna.] Zolotarenko, G.S.[Ed]. [Arthropods of Siberia and the Soviet Far East.], Nauka, Novosibirsk, 1985: 1-219. Chapter pagination: 199-207