The Miridae family of plant / leaf / grass bugs is huge, with thousands of species worldwide. This one, Leptopterna dolabrata, is a species I often see in the local meadows at this time of year and, during a recent walk, I found a little colony of them, with several adult males and females, mating adults, and nymphs that I have tentatively identified from looking at their colouring as male and female, though I may be wrong about those. So, the photos below are, I think, female nymph (left) and adult (right), male nymph (left) and adult (right), and, most obviously, a male and female mating.