Tachinid Fly

A black Tachinid fly, probably a Thelaira negripes (Diptera: Tachinidae).

Photos taken in Whiteknights Park, Reading, UK, on 2013-06-15.

Hoverfly

A female Leucozona lucorum (Diptera: Syrphidae).

Photos taken in Whiteknights Park, Reading, UK, on 2013-05-15.

Dolichopodid Fly

A male Argyra sp, probably Argyra argyria (Diptera: Dolichopodidae).

Photos taken in Whiteknights Park, Reading, UK, on 2013-06-15.

Another Hoverfly

Another male hoverfly of the Cheilosia albitarsis group, this time with all yellow halteres.  Probably another Cheilosia albitarsis or Cheilosia ranunculi.

Photo taken in Whiteknights Park, Reading, UK, on 2012-05-18.

Hoverfly

A male hoverfly of the Cheilosia albitarsis species group, probably Cheilosia mutabilis (Diptera: Syrphidae). Cheilosia albitarsis or Cheilosia ranunculi (Diptera: Syrphidae).  Initially I thought that it might be Cheilosia mutabilis because of the black on the haltere, but Roger Morris pointed out in the comments below that this is not necessarily diagnostic.

Dark or partly dark halteres distinguish C. mutabilis from C. albitarsis and C. ranunculi, the other two members of the group.

Photos taken in Whiteknights Park, Reading, UK, on 2012-05-18.