This intriguing looking insect is an Oak Treehopper. They are common on oaks (quercus) and usually aren’t cause for concern. Often considered a pest, they typically only show minimal damage by minor stem scaring caused during oviposition. Oak Treehoppers mainly hatch in the spring and reach peak numbers by late March into May. There are a total of five nymphal instars and adults are sociable and often found in groups. Read more on the Oak Treehopper at BugGuide.net.