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C. femorata has long been regarded as synonym to marginata, that is probably the reason why it was never taken into account (also in the NL). In the NL probably all/most marginata specimens are actually femorata. Your specimens look more like femorata too because of the white facial hair. Just an observation; in France I collected quite a few specimens with yellow facial hair and all in a fir forest. In NL you will hardly ever find "marginata" in coniferous forests. So, I suspect that marginata is a species of coniferous forests and femorata of deciduous forests.