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Using the link that you kindly provided
http://www.robberflies.info/keyger/htmle/keychoerades.html
I still arrive at C. dioctriaeformis (that has a lower scape/pedicel ratio than femorata, even if it's not written in this website).

But local peculiarities, like particular colors of dutch marginata (I was unaware of them), are not considered in those keys, so they may be not suitable for Holland, and in this case better to stop to Choerades sp. male. Now I understand why in the checklist only C. marginata, if I remember correctly, is present in Holland.