Initially I thought it was a cicada killer wasp, but I have never known them to socialize so I think it must be another species of large wasp. Perhaps they're building a nest?
Abdomen is yellow with five black stripes. Long, pointed stinger.
Found on the George Washington University campus using a yellow pan trap.
Feeding on a Scuppernong.
The Vespidae are a large (nearly 5,000 species), diverse, cosmopolitan family of wasps, including nearly all the known eusocial wasps (such as Polistes annularis) and many solitary wasps. Each social wasp colony includes a queen and a number of female workers with varying degrees of sterility relative to the queen. In temperate social species, colonies usually only last one year, dying at the onset of winter. New queens and males (drones) are produced towards the end...