This is a Diphucrania species. A large green jewel beetle on foliage of black wattle. This species feeds on foliage rather than flowers. I saw three today, the other two were not as brightly colored (more green than purple) and might represent a different gender.
This beetle is a Diphucrania sp. It feeds on Acacia foliage rather than nectar of flowers. This uncommon species has white spots on a purple elytra. The elytra are finely haired. The head and pronotum is sometimes green, as in this example.
Many plants growing along the rail verge south of the Macedon station.
In previous years only a few plants have been observed at this location but now there would be 30 to 50 vigorous plants over a larger area.