This wasp was seen a number of times on the trunk of a dead Sugar Gum. This tree had numerous hole in it about 5mm diameter some of which were probably occupied by other insects. The only insects I saw which could be assumed to lay their eggs in such holes were several species of masked bee.
Classification
from Australian Faunal Directory
Order Hymenoptera - Wasps, Ants, Bees and Sawflies, 12202 named species in Australia
Family Braconidae - Parasitic Wasps, 740 named species in Australia
Genus ?
Species ?