I looked up Paul Whitingdon's original description for his specimenss from Wonboyn and agree that this is the most likely ID, although I don't have the Johns and Rentz key available.
Thanks for putting stuff up on NM -its always useful to have new species there. I assume you got an ID confirmation for erinaceum adults. I will have a look on i-naturalist for any nymphs - yours does look very black. There are no records of erinaceum on ALA yet. Bargo would be at the edge of the Sydney Sandstone Basin, so distribution could fit
@RogerF Sorry I have no expertise in this area. I am currently copying my iNaturalist observations onto NM to hopefully improve accuracy of identifications. I used A. erinaceum as it seem to more closely fit the photo ids on iNaturalist and distribution , plus I have had one ID agreement for A. erinaceum. Hopefully NM can confirm or re ID.