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Ommatius sp.
I think it might be a robber fly
You're welcome. Because of these differences I did not suggest a "species" (genus + species) but only the genus -- which I think is a good guess -- because it does occur in your area. The site I used in the suggestion is excellent for your (and my!) area but it is not comprehensive. It only contains what they have seen.
It is somwhat similar to the golden feathery antennae robber fly however, look at it's legs, they have a different colouring pattern. and as you mentioned, they don't have the yellow abdomen of the one in my photo. But thanks for the suggestion Frazier!
EXCEPT for the yellow abdomen it looks quite like http://www.brisbaneinsects.com/brisbane_...
It is a robber fly - sorry I can't help you past that point. Beautiful shots!