Large, body about 15-20mm long. Saw it feeding, with its very long mouthparts, on a Radinosiphon leptostachya. Also seen this same species feeding from a Hesperantha coccinea more recently.
Taking a break from the thumping southeaster on a Pelargonium capitatum. The fly has been in the same spot for over an hour. Poddling around on the leaves.