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Tectocoris diophthalmus
Bright electric blue beetle-like bug with six orange spots. 8mm length. Big sucking tube on face. :) (Found sharing the juices of larva with some shield bug)
Eucalyptus
The single orange dot on the nymph seems quite consistent. You're right take due caution about ID's. I would not be surprised to see a sap feeding bug take some opportunistic protein. Fascinating observation.
I have also spotted this one in victoria (adult) http://www.flickr.com/photos/66925960@N0...
I looked at those martin but I wondered about the front double orange spots compared to a single central one on the cotton harlequin bug... and the way it was seemingly sucking larva juice when the CHB is meant to be vegetarian ??