Muscid Fly

A male Phaonia valida (Diptera: Muscidae).
Photos taken in Whiteknights Park, Reading, UK, on 2013-08-10.
A male Phaonia valida (Diptera: Muscidae).
Photos taken in Whiteknights Park, Reading, UK, on 2013-08-10.
A female Sphaerophoria sp (Diptera: Syrphidae). It is not possible to identify the species of females in this genus from photographs alone.
Photo taken in Whiteknights Park, Reading, UK, on 2013-08-10.
A black and yellow sawfly, probably Tenthredo distinguenda (Hymenoptera: Tenthredinidae).
Photos taken in Whiteknights Park, Reading, UK, on 2013-08-03.
A female Eustalomyia hilaris (Diptera: Anthomyiidae).
In this species the line that runs along the top of the thorax broadens to form a blob at its hind end:
Photos taken in the Wilderness, Whiteknights Park, Reading, UK, on 2013-08-10.
Nowickia ferox (Diptera: Tachinidae).
Photos taken in the Wilderness, Whiteknights Park, Reading, UK, on 2013-08-10.