Many of these under Spotted Gum Lerp Psyllid lerp:
and
probably that species, though I've read that other eucalyptus psyllids may also take shelter under the Spotted Gum Lerp Psyllid's lerp, and there were quite a few eucalyptus psyllid species about. Haven't studied the nymphs enough to be able to tell them apart yet - will look into it later.