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Hello, in many countries C. femorata is still regarded as a synonym of C. marginata, the two are very similar. In the NL only marginata ia accepted at the moment but almost all pictures (and the specimens in my collection) are femorata. In my opinion a good publication in a renomated paper is necessary to solve this problem. In respect to your specimen we also need to see the ratio of the antennal segments. The white face is an indication for femorata.