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Thank you very much for these details.

I’ve found the link "Art auswählen" on http://www.asilidae.de that leads to 81 known robberflies species in Germany. I saw the key on http://www.robberflies.info. But these type of keys are focussing so much on morphology. Would be helpful if it were possible to eliminate sets of genus or species as a first step - as you described it - on the basis of known details like habitat, mode of behavior, season, region where the animal was found, plants and other animals found there a.s.o.. The next step could be to compare photos of the remaining species with details about their commonness. But i guess there is only insufficient data and knowledge available about things like mode of behavior, flight season, details about the habitat.