Citation: Speight, M.C.D. & Goeldlin, P. de Tiefenau 1990 Keys to distinguish Platycheirus angustipes, P. europaeus, P. occultus and P. ramsarensis (Diptera: Syrphidae) from other clypeatus group species known in Europe. Dipterists Digest 5: 5-18
Number of Pages: 14
Keywords: Diptera, Europe, Insect, Key, Syrphidae