I’m also based in Canberra and have almost no etymological knowledge — a friend with more has suggested pristhesancus plagipennis but she wasn’t confident of it based on my photo alone.
From what I can find on ALA, Pristhesancus plagipennis is the most common of the Pristhesancus genus. See:- https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:e25f9b37-5501-4494-a1f7-a55dd22f01ee#classification. Also:- https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:1aa7543e-6e61-4b3c-a244-7de1356c9568. Gallery:- https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:1aa7543e-6e61-4b3c-a244-7de1356c9568#gallery The photo by geoffbyrne looks very close except for the colouring.