Larvae feed on Eucalyptus foliage and are shown here.
Classification
from Australian Faunal Directory
Order Hymenoptera - Wasps, Ants, Bees and Sawflies, 12202 named species in Australia
Superfamily Tenthredinoidea - Sawflies, 161 named species in Australia
Family Pergidae - typical Sawflies, 140 named species in Australia
Genus Perga
Species Perga affinis - Steel-blue Sawfly