Cooloola Shortwing nymph

I believe the tibia color is important for ID and would therefore confirm the Cooloola diagnisis

Cool, thanks!! Definitely the best match. : )

yeah - go with the cooloola shortwing nymph

no the baby 'beautiful methiola' is very different..

I looked at that - it looks so different from the adult version, but the juvenile is very similar.

maybe it didn't eat its greens... what about the baby version of this?
http://www.brisbaneinsects.com/brisbane_...

It definitely looks like it. I don't know much about bugs but I'm sure you're on the right track - that resource you posted is great. What about Beautiful Methiola?

some sort of grass hopper? (very like 'little black-knees' but with brown legs)

Hmm, I'm not sure - the legs are the wrong colour??