(Saunders, 1868)
Easily confused with other 'black n yellow' trifasciate jewel beetles in our area though elytra is heavily costate (furrowed) and its overall reflections (of the black areas) are blue/purple.
ALA has many sightings (233) listed though primarily in the Sydney region and in southern VIC.
Barker's 'Castiarina' has lengths as male: 11.6mm and female: 13mm
Castiarina rectifasciata is listed in the following regions:
Canberra & Southern Tablelands
Places
Yaouk, NSW