The adult dogwood spittlebug has distinctive black and yellow markings.
The nymphs (juveniles) suck the sap of dogwoods (Cornus spp.), while the adults feed on dogwoods, plus blueberries, farkleberry, deerberry, huckleberry, and other plants in the genus Vaccinium.
These hoppers are less than ¼ inch long. As with other spittlebugs and froghoppers, the adults are amazing jumpers: now you see them, now you don't.
Learn more about this and other spittlebugs and froghoppers on their group page.