Central Texas naturalist Brush Freeman sent me this photo and commented that he suspected it to be a Potter Wasp. Looks to my eye to be a close match to other images on the Guide of Pachodynerus erynnis. I am adding it to the Guide as there are no images of the species from Texas yet, or for that matter from any state west of the Atlantic coast. A standard-issue housefly is included for scale.

Brush added that this wasp is common in Port O'Connor during the fall and winter, often nectaring on Pentas, but is absent during the spring or summer. He reports seeing it once on Matagorda Island, but not at all in Willacy or Kenedy County to his south, despite looking at many wasps in those counties.