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Taken on Manbulloo Station, near Katherine in the Northern Territory, Australia (ie tropical) in April. About 5mm.

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Looks structurally somewhat similar to
Rhiniinae of Calliphoridae, but this is just a guess.

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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.