Hi Michael, hi Mark, I propose Melobasis sp., possibly Melobasis thoracicus due to the purplish colour. I propose it is at least in Melobasis, not being Ethonion as there is no deep sulcus (groove) whatsoever on the frons between the eyes (a deep sulcus on the frons is diagnostic for all species in Ethonion, a function of the bulbous shape of the eyes), and, though difficult to tell, not Diphucrania as there is no obvious carina on the pronotum laterally, such being present in Diphucrania, nor a shallow sulcus or depressed area between the eyes which is present in Diphucrania. In fact this specimen has no depressed area between the eyes at all. Also, the broad frons (space between the eyes at the front of the head) and which appears to be without a depression and is either flattened or even slightly convex also suggests Melobasis. Happy to be corrected of course. Try to find other specimens, and if you find any try to take some pics looking straight above the specimen if you can. Cheers! Allen M. Sundholm.
It’s definitely a Buprestid and , being on Dillwynia, is likely to be either a Melobasis, Diphucrania or Ethonion. I would lean towards a Diphucrania at this stage however without better pictures it may have to remain a mystery