Delta Flower Scarab (Trigonopeltastes delta)
I could not find a great deal of information on these beetles in the popular literature. They are not agricultural pest and, therefore, not a great deal of research has been done.
Delta Flower Scarabs are common in the Southeastern United States as far north as New Jersey. Adults take pollen and/or nectar. Mating occurs on flowers. (In this case Slender Mountain Mint.) Their common name refers to the distinctive triangular pattern on the pronotum which resembles the Greek letter Delta. That's about all BugGuide had to offer in the way of information.
