
I believe our subject is Brochymena arborea, also known as the Rough Stink Bug. After photographing it I did a little research and was surprised to learn there are several beneficial species of stink bugs, the Rough Stink Bug being one of them. While many stink bugs feed on plants and cause crop damage there are also species, such as this one, that prey on caterpillars and other crop damaging insects.
Virginia Integrated Pest Management published the Field Guide to Stink Bugs which explains how to identify stink bugs in the Mid-Atlantic region and identifies the beneficial ones.