From a month ago: a pair of Nemophora degeerella (Lepidoptera: Adelidae) mating. This summer whirling swarms of between 3 and about 20 of these moths have been quite common, usually in sheltered clearings between the trees. I was walking through one such swarm when these two suddenly dropped out of the swarm and fell into the long grass. The one with the longer antennae is the male.
Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2010-05-30.