This colorful beetle is very variable. There is a pattern on the pronotum which contains the impression of a 'u' or horseshoe. There is often flaring from the base of the elytra which can make bright patterns. The white markings along the striae are larger and stronger than for variicollis.
This beetle is Peltoschema perplexa. I have determined this by comparison of its consistent pattern with the museum of Victoria collection. This beetle seems to be scarce and I have seen it only twice. Peltoschema is a genus of Acacia feeders and this one seems to occur on the small leafed wattle illustrated. Maybe someone knows the species. Christmas Hills has a population of these wattles and we found many beetles that day