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Thank you very much Theo!
But are floralis & sepulcralis different species?
fauna-eu call Musca s. as a synonym of O. floralis.
H. Schumann's "Revision der Gattung Onesia..." names 6 species:
O. sepulcralis, austriaca, canescens... and floralis as a synonym of sepulcralis. I could not find a source with sepulcralis and floralis as separate species. :|