This is Paropsis aegrota.
This leaf beetle feeds on Eucalyptus leaves. It is a large leaf beetle with several white warty blotches on each elytra. The large dot positions are improtant for identification and the smaller ones are variable.
This slender leaf beetle was about 10 mm long. Ihad heavily pitted elytra with black, cream and purple stripes. The elytra appear to be drawn out into short spines at the apices.
The black thorax had a median ridge. Segmented antennae and the legs were black.
The beetle was resting with its body along the axis of the plant, the purplish stripes merging well with the plant.
Spotted on cutting grass (Gahnia grandis)