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This key is modified from Die Käffer Mitteleuropas, very good for the beginner. But start here http://www.coleo-net.de/coleo/texte/cantharidae.htm to try to separate Cantharis and Ancistronycha. Remember, please, that Cantharidae, although called "soldier beetles" due to their !niformity", are in fact highly variable in color!
Best wishes
Libor