I saw a similar beetle flying at Kama yesterday. Unfortunately it didn't stop long enough for a photo, and it was too high to see any spots. Are they particularly uncommon, and are there many species?
Looking at the ALA reference it seems they are not too rare: https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:93015953-bb2e-47e7-bd80-47f529ad41c6 They list 5 species of Rhipicera (Agathorhipis): https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:45a42abb-2dc1-4cfb-9dfc-a9cc2a925661#classification and one species of Rhipicera (Oligorhipis): https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:547f1da5-4a20-4f19-9743-f175d6c5a001#classification
Rhipicera femorata is one of those species that you may not come across frequently, but when you do there may be dozens or even hundreds of them. But they are generally all males; the females seem very scarce (or maybe just good at hiding). Some other Australian species of Rhipiceridae do seem to be genuinely rare.