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Genus Priocnemis

Wasp - Priocnemis - male Spider Wasp - Priocnemis oregona Spider wasp - Priocnemis Hunting wasp - Priocnemis minorata Black Spider Wasp - Priocnemis minorata Priocnemis oregona male?  - Priocnemis oregona - male Spider wasp - Priocnemis germana Small Wasp, red abdomen. Prionyx? - Priocnemis oregona
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 (Tarantula-hawk Wasps and Allies)
Genus Priocnemis
Numbers
15 species in three subgenera (Sphictostethus, Priocnemissus, and Priocnemis):(1)(2)

Sphictostethus (1 sp.)
1. Priocnemis pretiosa: AZ, NM

Priocnemissus (3 spp.)
2. Priocnemis minorata: eastern (Canada: NS, ON, QC; United States: east of the 100th Meridian; Pacific Northwest)
3. Priocnemis nigripes: AR, KS, MO, NC, NE
4. Priocnemis oregona: BC; AZ, CA, ID, NV, OR, UT

Priocnemis (11 spp.)
5. Priocnemis abbreviata: TX
6. Priocnemis aequalis: transcontinental Canada
7. Priocnemis cornica: MB, NB, ON; transcontinental United States
8. Priocnemis germana: AZ, CO, Transitional Zones from 100° W to Atlantic Coast
9. Priocnemis hestia: NH south to VA, WV
10. Priocnemis kevini: CO, ID
11. Priocnemis lasiura: CA
12. Priocnemis minuscula: KS, NC, SC, TX
13. Priocnemis nigriceps: IA, KS, TX
14a. Priocnemis notha alaskensis: AK, NT
14b. Priocnemis notha navajo: BC; AZ, CA, NM, OR
14c. Priocnemis notha notha: MB, NB, ON, PE, QC; Atlantic to Rocky Mountain states
14d. Priocnemis notha occidentis: CA, OR, WA
15a. Priocnemis scitula relicta: ON and QC south to NC, OH, and WV; CO
15b. Priocnemis scitula scitula: Upper Austral Life zone east of 100° W
Size
5-15 mm, females generally slightly larger.
Identification
Possesses characters of the subfamily Pepsinae, tribe Pepsini:
Groove in second sternite, crease on side of first tergite marking off an epipleuron, side of first tergite straight sided or slightly convex when viewed from above.
Serrate hind tibia in both sexes.
Lacks pocket in basioposterior corner of third discal cell and spine pits on dorsal side of hind femur.
Labrum at least partially concealed under clypeus.
Spines at end of hind tibia of equal size and spacing.

Priocnemis:
Lacks bristles on underside of apical tarsal segments
Has second transverse cubital vein straight anteriorly but strongly curved posteriorly.

Most similar structurally to Caliadurgus:
Females lack stout, spine-like bristle at apex of foretibia.
Anal lobe oblong, not subtriangular and without a straight side.
Pronotum of "normal" length.
Most individuals of Caliadurgus marked with red, but only some Priocnemis.
Range
Transcontinental. Many are widespread, others are either restricted or little known.
Habitat
Varied. Many inhabit woods but some are also found in open areas (meadows, waste places, etc.)
Season
The subgenus Priocnemissus, which includes the very common Priocnemis minorata, is vernal and can be found as early as March in southern parts of its range. Other species are found from late May through September in most of the country.
Food
Adults uncommonly visit flowers. Prey species are extremely variable and as a genus they take spiders from nearly every common family in North America.
Life Cycle
Most species do not dig burrows from the surface of the ground but instead dig chambers off the side of a pre-existing crevice or mammal burrow. Many species have several (2-3 in the north) generations per year.
Remarks
Two species were described in 1986 by Marius Wasbauer that obviously would not be included in the references below, P. kevini and P. lasiura.
See Also
Very similar to Caliadurgus
Print References
Townes, H.K. 1957. Nearctic wasps of the subfamilies pepsinae and ceropalinae. U.S. Nat. Mus. Bull. 209: 1-286. (species descriptions, distribution, keys). (Relevant Section)

Krombein, K.V. 1979. Pompilidae, pp. 1523-1571. In Krombein, K.V., P.D. Hurd, Jr., D.R. Smith, and B.D. Burks, eds. Catalog of Hymenoptera in America North of Mexico. Vol. 2 Apocrita (Aculeata). Smithsonian Inst. Press, Washington, D.C. (list of species, except recently described [see Remarks], prey records, distribution)
Internet References
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.Nomina Insecta Nearctica
Poole, Robert W. Nearctica.com, Inc.