Syrphus venustus friuliensis Van der Goot, 1960
Dasysyrphus friuliensis (Van der Goot, 1960)
Syrphus postclaviger carpathicus Stys et Moucha, 1962

Note: Locke and Skevington (2013) include this species in their "Dasysyrphus intrudens species complex". These authors write that this complex obviously consists of several species in the holarctic region, but the species boundaries cannot be defined yet and therefore they do not differentiate any species within the complex. I agree that this species complex very likely contains multiple closely related species, but I do not adopt the lumping of the hitherto described species into an undifferentiated "superspecies". The European members of the "Dasysyrphus intrudens species complex" have so far been grouped together in the species Syrphus friuliensis, and therefore I keep this taxon here. It will be interesting to see whether the European species in fact comprises several cryptic species, or if the European species is identical to one of the multiple nearctic species.