found it:
Perga Dorsalis
Steel-Blue sawfly (you'll need to scroll down down a bit its not the first image)
http://www.brisbaneinsects.com/brisb...s/Sawflies.htm
and
http://www.ento.csiro.au/education/i.../pergidae.html
identical
well, glad we sorted that one out!
Thanks Paul (and Ken)
frank