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Thanks Tony - that's really helpful. It means we can eliminate all of the Tabanus sp listed for the area. A bit more digging and I have discovered that the Magnetic Island species is now called Cydistomyia alternatus magneticus. There are 22 species in total, of which a rather alarming number seem to be concentrated in North Queensland, but there are 5 species that seem possible for Eucla. Having looked at the few images on the web of Cydistomyia, they seem to have in common the rather pale dun coloured body, long pale antennae and very clear wings (can't tell about the eyes, as the images are of dead specimens). Thus, I have a strong suspicion that my father's fly is Cydistomyia sp.