On a goldenrod leaf. There were many of these tiny treehoppers being tended by ants. When I held up this leaf to get a photo, I was given quite a nasty nip by one of the ants. But then that is their 'job'. They ward off predators and in return they get to savour the honeydew that these bugs secrete. Here, there are two nymphs, top, and an adult, bottom.