@article {574, title = {Keys to distinguish Platycheirus angustipes, P. europaeus, P. occultus and P. ramsarensis (Dipt., Syrphidae) from other clypeatus group species known in Europe}, journal = {Dipterists Dig. (Ist Ser.)}, year = {1990}, pages = {5-18}, abstract = {

The clypeatus group of species in the genus Platycheirus is defined. Separate keys are presented for distinguishing the males and females of the 12 European clypeatus group species. All available information, including distribution records, is summarised for P.anguslipes, P. europaeus, P. occultus and P. ramsarensis.

}, url = {http://www.dipteristsforum.org.uk/documents/DD/df_1_5.pdf}, author = {Speight, MCD and P Goeldlin de Tiefenau} }