Chalcid Wasp

A small Chalcid wasp, probably Sycophila biguttata (Hymenoptera: Eurytomidae, order Hymenoptera), on an oak leaf.

The black 'bar' across the wings is actually two black spots, one on each wing.

Initially, I thought this was the first time I had come across this species, but it turns out that I had actually seen one last November, see here.

Photos taken in Whiteknights Park, Reading, UK, on 2010-07-30.