Appearance

Abdominal segments constrict at the margins in these wasps. The outer veinlet of submarginal cell three meets the marginal cell not beyond its outer third. Terga lack median or submedian transverse depressions. Females feature unusual projections on the clypeus and clypeal margin for distinct modification.

Habitat and Range

Females excavate cavities in firm bare soil for nests. This genus spans worldwide with strong presence in various regions. In North America, 86 species exist, of which about 30 reach Canada. Eastern United States hosts 29 species in diverse environments.

Behavior

Females hunt adult beetles from families like weevils, Scarabaeidae, Cerambycidae, Tenebrionidae, Buprestidae, and Chrysomelidae. Some provision nests with bees or wasps; one species targets Curcio nasicus exclusively. They nest in aggregations, often reusing old nests by digging from entrances. Burrows form vertical shafts up to 1.3 meters deep with horizontal branches. Nests contain under ten cells, stocked with up to twenty prey items each. Parasitic Mutillidae may invade these nests. One species involves daughters assisting mothers in guarding duties.

Life Cycle

The life cycle centers on provisioning nests with prey for larvae. Females lay eggs in cells after stocking with paralyzed beetles. Larvae consume the provisions to develop fully. Pupation occurs within the nest cells before adult emergence.

Economic Impact

As predators of beetles including weevils, these wasps hold beneficial status. They help control pest insect populations naturally in ecosystems. No direct economic harm noted; their role supports biodiversity without costs.

This preserved specimen highlights the unique female facial projections, ideal for wasp nesting studies. Check it out on BugGuide! https://bugguide.net/node/view/12521