This commonly parasitises Lepidoptera larva, including the larvae found within galls.
Glabridorsum stokesii
Late December 2011
Mount Field National Park
Investigating the crevices at the base of a gum tree.
References:
Bashford, R. 2006. The insect complex inhabiting galls formed by Cecidomyia acaciaelongifoliae Skuse (Diptera: CECIDOMYIIDAE) on Blackwood (Acacia melanoxylon) in Tasmania. The Australian Entomologist 33(1): 1-4.