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From the Netherlands only Choerades marginatus (marginata) is accepted at the moment until trustworthy information is published. Actaully most Dutch specimens seem to be C. femorata. Almost all (both sexes!) shiny white facial hair. Geller-Grimm notes that C dioctiaeformis is a doubtful species as it is very hard to seperate: http://www.robberflies.info/keyger/htmle/chodio.html

Further more in available keys it says male C. dioctiaeformis should have white hair on first 3 tergites. This one has yellow hair. Long story short, in the Netherlands all these Choerades look-a-likes are named C. marginatus until more reliable information is being published. Research is going on. Havea look here: http://waarneming.nl/soort/photos/8219