Sorry, should certainly be Phaneropterinae not Paneropterinae. Arethaea gracilipes is to my knowledge an US species and not found in Australia. It might be a Polichne sp., unfortunately there are many undescribed ones in Australia. You probably would need an expert to get down to species or at least genus level.
https://www.flickr.com/photos/63479603@N00/12009035844
http://www.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=178430
Some links for Arethaea gracilipes:
http://www.opsu.edu/Academics/SciMathNurs/NaturalScience/PlantsInsectsOfGoodwell/orthoptera/katydid1.html
http://bugguide.net/node/view/465024
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