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For the Central European species, there is a very nice key by Tschorsnig & Herting. Thanks to Chris Raper, there is an English translation available:

http://tachinidae.myspecies.info/node/17

Of course, in many, if not most cases, your fauna is totally different. BUt in the case of Phorocora, it seems the eastern and western Palaearctic species are identical.

Your picture shows Phorocera obscura.

Theo