This fly with stripy eyes is about 75ml long. Beautiful shiny metallic colours, with black and white front legs, yellow/gold other legs. It was picking up one front leg, waving it in the air, put it down and repeat with the other front leg, put it down and wave its haltere's. Then repeat the whole process."
Physiphora aenea, which more recent references say is a synonym for
Physiphora alceae, and
Physiphora demandata, likewise said to be a synonym for
Physiphora clausa"
bugguide.net/node/view/33447 See information from
Tony below. More photos of these
here