Syrphidae literature

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We found 2 records. keyword "Parasyrphus nigritarsis" and ordered by year

Speight, M.C.D. (1986): Cheilosia nasutula, Neocnemodon vitripennis and Parasyrphus nigritarsis: hoverflies (Diptera: Syrphidae) new to Ireland - Ir.Nat.J. 22(4), 149-152
Falk, S.J. (1992): Parasyrphus nigritarsis (Zetterstedt) and some other scarce flies recorded from Malham Tarn, N.W.Yorkshire - Dipterists Digest 11, 40