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Genus Hemipepsis - Tarantula Hawks

Wasp - Hemipepsis ustulata - male - female Hemipepsis ustulatus - Hemipepsis ustulata - male Spider Wasp Wingman - Hemipepsis ustulata - male - - Hemipepsis ustulata - male Tarantula Hawk Body Scan - Hemipepsis ustulata - male Tarantula Hawk Body Scan - Hemipepsis ustulata - male Tarantula Hawk Body Scan - Hemipepsis ustulata - male Tarantula Hawk wasp? - Hemipepsis ustulata - female
Classification
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)
Superfamily Pompiloidea (Spider Wasps, Velvet Ants and allies)
Family Pompilidae (Spider Wasps)
Subfamily Pepsinae
Tribe Pepsini
Genus Hemipepsis (Tarantula Hawks)
Other Common Names
Tarantula Wasps
Numbers
Krombein(1) lists 3 North American species in the genus.
Size
Forewing length 11-27 mm (2), body length somewhat longer (and appearing longer yet when taking into account the long legs and antennae).
Identification
Key to species on pg. 33 of Townes(1957).

Hemipepsis are quite similar looking to Pepsis and Entypus, but distinguishable if clearly resolved images of wing venation are available. For details, see the posts thumbnailed below:

See also comments by Nick Fensler under this post.
Remarks
Both Hemipepsis and Pepsis are called "Tarantula Hawks." The genera are difficult to distinguish in the field and have very similar life histories. See account for Pepsis.
See Also
Print References
Milne has photo of Hemipepsis sp.--#458, describes, p. 839. (3)
Internet References
Univ. Calif. Riverside Insect FAQ--describes biology of Pepsis and Hemipepsis as identical, says genera difficult to distinguish (based on wing venation).
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.Nearctic Wasps of the Subfamilies Pepsinae and Ceropalinae
Henry K. Townes. 1957. Smithsonian Institute Press (Bulletin 209).
3.National Audubon Society Field Guide to Insects and Spiders
Lorus and Margery Milne. 1980. Knopf.