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Stephane, you are an asset, if you will forgive my saying so!
When you said Platypezidae, I did a double-take, and then the memories of that previous search came flooding back (not the same species as it happens, but so much the better).
I spent a couple of hours yesterday fruitlessly trying to trace my previous search several months ago. You may be sure that this time I will document it properly!
Merci beaucoup and all the best,
Jon