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Tschorsnig is so much easier to,operate than the old Mesnil-keys, I totally agree.
For identification of photos at generic level: www.tachinidae.eumis most useful, since you can enter what you can see and can leave out the rest.

As for tessellans, yes, that is a valid argument, yet the humerus is too yellow for tessellans. Saying that the tibiae are yellow in picta is incorrect, it is more like dark red. So, this picture is in between, that why I am reluctant to give a definetive ID.

Theo