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Thank you Chris. Here's what I'm looking for: to be certain of my results. I would like to be certain because the Belgian Institute of Natural Sciences gave me all his undetermined Tachinid material. But I'm rather a beginner!! With Tschorsnig's key I feel confident with genera but not with species. The best way to be certain would be to have a complete description of all Tachinid species. I guess that this ideal situation is not reachable. That's why I wanted to know more about Mesnil's work. Not to buy a copy but perhaps to make a photocopy of it!!! :D