After reviewing several of the detailed ID descriptions of the wasps in this genus that are listed on the DiscoverLife.org website, I have concluded that this wasp is most likely a female Ammophila cleopatra.

Here is a link to the ID info, for this specific species, on that website:
DiscoverLife.org listing for Ammophila cleopatra

Please note the following characters from that website's information that can be seen in my images:
1) - Female. Average length 20.5 mm., range: 14.5-24 mm.
2) - Color. Black; tegula orange or brown, sometimes black anteriorly; abdomen red except for black gastral segment V and triangular black spot on tergite IV (western United States) or petiole sternite and most of tergite black and only gastral segment I red (east of one-hundredth meridian).
3) - Range. (fig.148). Ammophila cleopatra occurs from the Pacific Coast to Michigan, Illinois, Missouri, Arkansas and Alabama, A few males have been seen from North and South Carolina and Georgia that appear to be cleopatra. More collecting is needed in the eastern United States to accurately determine the range of cleopatra. A. cleopatra occurs over much of the north central plateau region of Mexico.
4) - Variation. A. is blacker east of the Rocky Mountains as indicated in the description. The scutal rugae are sometimes feeble or lacking especially in material from the northern part of the range.
5) - Systematics. This species can usually be recognized by the transverse rugae or ridges on the scutum. In addition, the perpendicular arrangement of the hairs forming the propodeal aide of the band along the metapleural sulcus is distinctive (fig. 52).
Also noted: Fernald (1934) confused this species with juncea Cresson. He also identified some of the eastern cleopatra as urnaria or “arvensis”.
END (of web reference list)


NOTE: Further investigations of variable traits may confirm that on many western species, the abdominal segments may have more or less black coloring in them and they may be almost all red, such as in the case of this particular wasp.
Here is a link to a video that I made of another female wasp, very similar this one, with more black on the petiole and a fuzzy black spot on the segment T4: (3min. duration) ♀ Thread-waisted Wasp Covering Up - Ammophila cleopatra

Moved from ID Request.