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Genus Eremnophila

Wasp - Eremnophila aureonotata  Eremnophila? - Eremnophila aureonotata thread-waisted wasp - Eremnophila aureonotata - male - female 29Jul2017.pgtcenter.HN.hymen6 - Eremnophila aureonotata - female what wasp Pruyn Audubon Sanctuary native garden - Eremnophila aureonotata Unknown wasp at pollinator garden - Eremnophila aureonotata Eremnophila aureonotata is it a Gold-Marked Thread-Waisted Wasp (Eremnophila aureonotata)? - Eremnophila aureonotata
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
No Taxon (Apoidea sans Anthophila – Apoid Wasps)
Family Sphecidae (Thread-waisted Wasps)
Subfamily Ammophilinae
Genus Eremnophila
Synonyms and other taxonomic changes
Formerly treated as part of Ammophila
Explanation of Names
Eremnophila Menke 1964
A single species in our area,(1) 9 spp. total(2)
most easily identified by the silvery patches on the sides of the thorax (pronotal lobes and mesopleura) and next to the propodeal spiracle and petiole socket:

Ammophila and Podalonia) have no such patches.
In rare cases the patches may be absent:

In such cases, look at the episternal sulcus, that forms a sharp, rear-pointing angle in Eremnophila, vs being straight or slightly bowed in other genera of the subfamily, as illustrated here (Figs. G-H: 'es')(3)
NA east of 100°W, south to Costa Rica(3)(2)
Males grasp neck of females with mandibles during mating:
Eremnophila and other sphecids are often followed by satellite flies, which attempt to lay their eggs of the wasp's prey:

In e US and Canada, Eremnophila may be more common than Ammophila (cf. this comment)
Works Cited
1.Catalog of Hymenoptera in America North of Mexico
Karl V. Krombein, Paul D. Hurd, Jr., David R. Smith, and B. D. Burks. 1979. Smithsonian Institution Press.
2.Pulawski W.J. (2003-) Catalog of Sphecidae sensu lato (Apoidea excluding Apidae)
3.Sphecid wasps of the world: a generic revision
Richard Mitchell Bohart, Arnold S. Menke. 1976. University of California Press.