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Since everyone is rather baffled most of the time by P. ustulata and P. anderssoni, I once again tried to find the paper with the original description online. Having failed many times I was pleasantly surpirsed to find the journal issue with the paper is now online at archive.org. I downloaded the issue and extracted the Rotheray and MacGowan paper and put it in the downloads section. Just scroll down till you find it at www.diptera.info/...?cat_id=16 (currently on the second page).