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Genus Eremnophila

Eremnophila aureonotata? - Eremnophila aureonotata - male - female Wasps - Eremnophila aureonotata - male - female Mating Insects - Eremnophila aureonotata - male - female Thread-waisted Wasps - Eremnophila aureonotata - male - female Spotted Thread-waisted Wasp  - Eremnophila aureonotata 29Jul2017.HillCrk.HN.hymen1 - Eremnophila aureonotata - male Wasp - Eremnophila aureonotata Eremnophila aureonotata - male - female
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 (Apoid Wasps (Apoidea)- traditional Sphecidae)
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.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.
2.Catalog of Sphecidae sensu lato
3.Sphecid wasps of the world: a generic revision
Richard Mitchell Bohart, Arnold S. Menke. 1976. University of California Press.