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Thank you Tony T. A little bit of digging has eliminated T townsvilli and T particaecus as they both have quite strongly darkened wings, and are generally just too dark all over. I think T umbripennis can be eliminated too, as I have found a partial description for it which states it has a black scutellum with greyish overlay - it doesn't seem to quite fit the fly in question. This fly looks a lot like the ones that drive people mad on Magnetic Island, and which I assume is T alternatus magneticus. I have a suspicion that T maini might look very like the Magnetic Island species, and so perhaps that is what we have here. I can't find out anything about T calabyi though, and as always with Australia and diptera, the published distributions for species are incomplete, so it could easily be something not currently on the list for SA or WA.

Are any of the Australian Journal of Zoology articles available as free downloads do you know? I couldn't make their site work today, but previously when I have looked on it, back issues seem to be $25 each.