Eucalypt scale galls

Might be galls of males from the gall-inducing scale insect genus Tanyscelis

Very cool, have been hanging off on photographing galls as well

Although these do resemble the male galls of Apiomorpha, the shape of the galls suggest that they could also belong to another genus of gall-inducing scale insect.

I am a recent convert to gall insects and they are very complex I think these are Gall-inducing Scale Insect (Eriococcidae). The dry ones are last years crop. They can be very sexually dimorphic - http://www.projectnoah.org/spottings/7837069. That would suggest that these are males and they have left to find girlfriends. Females look like this http://www.flickr.com/photos/66925960@N08/6343855408/in/set-72157627717316074 and remain wingless. You spotted a similar gall (wasp) but these are hamipterans (bugs).

they look like spent cartridges !!