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Thanks - the way it is holding its proboscis is like your Rhiniiae, certainly. It is interesting that this one has this rather odd completely dusted look, whilst your pics all show metallic flies, more what you would expect from Calliphoridae. The family makes sense though, when you consider that Manbulloo is a cattle station, and there is obviously a population of feral horses, all producing the raw material that Calliphorids favour.