We had a visit from this species of fly for the first time last year 2018. It is in the garden again 2019.An introduced fly to control green vegetable bug - Pentatomidae - Nezara viridula See article: blog.une.edu.au/thesweepnet/2011/03/28/parasitism-in-gree...Photos: FrediNaturalist 6 Feb 2021: "This is very probably a T. pictipennis. Considering the terminalia drawn in Dugdale, this is the species introduced in the region (even though it was done with a different name). " This is very probably a T. pictipennis. Considering the terminalia drawn in Dugdale, this is the species introduced in the region (even though it was done with a different name). Rodrigo Dios
For the wing enthusiasts; the wing of the horse bot-fly, Gasterophilus intestinalis. The fly itself could easily be mistaken at a glance for a syrphid or bumble bee. This insect is not native to Australia and is an internal parasite of horses.