To me it looks very much like some of the photos of Chortoicetes terminifera on CNM and on ALA. It was quite large. About 5cm long. Could have even been longer.
There are no Acridines as large at 5 cm. A female C. terminifera is about 3 cm in length and is only slightyl longer than the largest Austroicetes.. The distinguishing feature is the black hind wing tip. They also fly much further than Austroicetes when disturbed 5- 10m. Also they are immigrants to the local area and do not breed locally. The contrasting patterning is more suggestive of one of the larger Austroicetes sp..