Matches Celaenia dubia on http://www.arachne.org.au/01_cms/details.asp?ID=2386, but is more like C. atkinsoni in Whyte & Anderson's 'A field guide to spiders of Australia'.
Celaenia sp. (genus) is listed in the following regions:
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Bruce RidgePlaces
Ainslie, ACT Casey, ACT Evatt, ACT O'Connor, ACT