6 species in North America.
12-25 mm, dimorphism not quite as marked in this genus as in many other pompilid genera.
Fairly easily distinguished from other pepsines in the nearctic region:
Cubital vein of anterior wing usually reaching the wing margin.
Posterior wing with anal vein meeting medial vein at or distal the origin of the cubitus.
Clypeus very large and convex.
Transcontinental as a genus. Three species are restricted to the west (P. apache, P. coloradensis, and P. nigricans). Three species are fairly widespread (P. dakota, P. nebulosus, and P. nuperus)
Varied, from open woods and woodland edges to semi-arid grasslands, etc.
In the north this genus is found mid-summer to early autumn (approximately June to September). They have a longer flight period in the south.
They apparently rarely visit flowers. They provision nests with Agelenid spiders.
One generation per year in northern states.
Most similar to other large pepsine genera: Entypus and Cryptocheilus. Priocnemis minorata and Priocnessus nebulosus are superficially similar but date is usually sufficient to separate them.
Townes, H.K. 1957. Nearctic wasps of the subfamilies pepsinae and ceropalinae. U.S. Nat. Mus. Bull. 209: 1-286. (descriptions, distribution, keys) (Relevant Section
Krombein, K.V. 1979. Pompilidae, pp. 1527-1528. 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.