There was a small group of these hanging out on the petals of a small sunflower, a volunteer that came up from the compost pile. They were small enough that without optics, I thought "maybe flies," and ran for the 1-5X. For this reason t0o, I don't know whether these are two shots of the same individual or two shots two different individuals.

When any two of these met head to head, they touched antennae, but in the tens of minutes I spent watching (well, OK, desperately attempting to focus, since at these magnifications, there is almost no depth of field), I did not see any of them mating, or feeding, or doing anything more exciting than rubbing the hind legs together.