Reference
Dieter Doczkal, Jens-Hermann Stuke, P. Goeldlin de Tiefenau (2002): The species of the Platycheirus scutatus (Meigen) complex in central Europe, with description of Platycheirus speighti spec. nov. from the Alps (Diptera, Syrphidae) – Volucella - Die Schwebfliegen-Zeitschrift – 6: 23 - 40.