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I believe it is Thaumatomyia - the colouration and the very flat-topped scutellum suggest that it is that genus, but I cannot be certain of the species. The appearance of the fly is typical of one that has been attacked by Entomophthora (=Empusa) fungus. I don't know if this is the same species of fungus that attacks Melanostoma, Scathophaga and Muscidae (the flies we often see attacked)