I was photographing my sweet peas after a night’s heavy rain when I spotted this tiny wasp resting on one of them. It only grows up to 10mm long, and it is identified by the white, black and orange banded hind tibia. The overall ground colour is black and reddish, with a distinctive white spot at the rear of the thorax.
This is a parasitic wasp mainly of hoverfly larvae, pupae and eggs, but also other diptera species. The females use their long ovipositors to inject the host and lay eggs inside it, and when the resulting larvae hatch they feed internally and eventaully kill the host organism.
It is seen June to September, and found in meadows and hedgerows. It appears to be fairly common.
Photograph of Diplazon laetatorius, taken August 2016, rear garden , Staffordshire. © Pete Hillman 2016. Camera used Nikon D7200, with Sigma 105mm macro lens.