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Hello FrankH,

Yes, a more common Syrphidae found on tree wounds and an excellent photo. What is far more rare and exciting is the small black fly in the background. The eye has a eye fascia which is coloured and the face has a light horizontal stripe: Aulacigastridae!
Do you have a photo of that specimen? What I know of these flies is that they frequent sap runs on deciduous trees. Is this a confirous tree with resin or truly a Eucalyptus like tree with gum? Do you perchance know the species of tree?

Kind regards,

Ectemnius