Stiletto Fly (Acraspisoides helviarta)

This slender black stiletto fly was about 18 mm long. It was mostly black except for the tarsi, antennae and palps which were a light brown. Colourless wings had black triangular patterns. The abdomen had thin white bands. Legs were very long.
Spotted near the garden shed.
Like many other in the family, this one was behaving like a wasp - restless and very active.
The next upload shows the dorsal view.