Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

arlington County, Virginia, USA

Images of this individual: tag all
horntail? horntail?

I would say this is an Ichneumonid. That "boot-shaped" submarginal cell in the wing (quite visible in this picture) is characteristic.
Horntails are only distantly related to these, and have a "broadly-joined" abdomen and thorax (rather than the slender one evident here).