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Ok, maybe I'll try a examination of the specimens instead! I've done that previously, but not many times (I've never attempted to extract the genitalia of the males, is this simple?).

Could this key be used: http://www.coleo-net.de/coleo/texte/cantharis.htm ?

I've not found any other keys that included species like C. kervillei (muelleri), quadripunctata etc.