Small dragonflies have been flying in the grass of our yard. Not quite so many that I would call them a swarm, but a dozen or two. Their flight is not so rapid and overwhelming as some of the others I have seen–swarms of green darners earlier in the year, for example.
These seem to be mostly meadowhawks.
I think this is a male cherry-faced meadowhawk, Sympetrum internum, based on the red nose and the black legs.