Yellow Fly

A small yellow fly, probably   Palloptera quinquemaculata = Palloptera arcuata (Diptera: Pallopteridae).  Initially I thought it was a Minettia inusta (Diptera: Lauxaniidae) but was put right by Roger Morris in a comment to another post here. 

It might also be mistaken for a Tephritid fly such as Xyphosia miliaria, however, its wing pattern is subtly different, its eyes are smaller, and X. miliaria tend to found on or close to thistles, its host plant.

Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2012-06-13.