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I've been losing sleep over this one - :(
I'm really not convinced that this is an Agria. Pierre's photos show a fly that is quite unlike the Agria in http://www.dipter...ad_id=8185 (which I am happy is an Agria). Pape clearly states that Agria has black occipital and postgenal hairs, which this clearly doesn't. I suspect Pierre's fly is a male (look at those pulvilli!) Sarcophaga (Bercaea) africa. I shall be away for a few days, so shall be interested to see what opinions there are on my return! :)