Moved from Parancistrocerus or Stenodynerus.

The reddish tegula speaks against leionotus (in which the tegula should be yellow). Most likely this id P. vagus.

Moved from Potter and Mason Wasps.

This wasp appears to be Parancistrocerus leionotus, but with a few differences: The antennae's first segment, the scape; scutum at the connection of the head to the thorax; the tegula where the wings attach to the thorax are orange as are the femur, tibia and tarsal segments on the hind legs. On all of the images I have seen of P. leionotus, the scape, scutum, and tegula are yellow, the femur on the hind legs are black and the tibia are yellow with darker, orange tarsals. I could not find a match for that or the clear patterns of yellow field marks on the head, thorax and abdomen. Could someone look carefully at this and see if this is another species.
Also, the “typical” species is apparently known only from far northeastern U.S. and Canada. Perhaps this is a subspecies not previously seen in Texas.

Moved from ID Request.