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Sorry, have no info, on Aust. J. Zool. I have no knowledge of Aust. tabanids, just happen to have a few of Mackerras's papers.
T. maini has brown eyes, strongly converging frons, and black antennae. T. calabyi has brown eyes, converging frons, dark antennae.
The ref I gave gives a key and a description of the Aust. species. A quick look at his key and a description of some of the species didn't help me. I am not particularly good at relating a specimen to a description! I am OK at keying out a specimen in hand.
Possible that there are more species in Aust than were known when the paper was written (submitted in 1970)