Length: 20 - 25 mm in this family
Larval wood wasps bore in decaying wood.
Adults have a spherical head that is attached to a noticeable "neck."
Photo data: 15 June 2011. Female. In a ravine with rich soil and little sunlight; larger habitat was oak-hickory forest. Ruraldale, Upshur County, West Virginia.
GPS data: 39.0733, -80.2362. Elevation 383 meters.
Determined by Dave Smith, retired from USDA Agricultural Research Service.