Calomela curtisi
Calomela curtisi is found on black wattle. This species is not very common.
https://en.wikipedia.org/wiki/Calomela

Calomela curtisi is a species of acacia leaf beetle in the family chrysomelidae. They are red and blue, cylindrical and deeply pitted.
Similar species: Beetles
By Martin Lagerwey
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Uploaded Sep 19, 2016. Captured Dec 31, 2013 12:14 in Stephen Rd, Wonga Park VIC 3115, Australia.