Crossocerus harringtonii

Members of Crossocerus are small to medium-sized crabronid wasps with a compact body, short petiole, and reduced wing venation. Specific diagnostic features for C. harringtonii are not documented in available sources. The genus can be distinguished from similar crabronine genera by the combination of: mandible with a single preapical tooth; forewing with two submarginal cells; and tarsal claws with a basal tooth. Species-level identification within Crossocerus generally requires examination of male genitalia and detailed facial sculpture patterns.

Recorded from western North America, specifically Alberta, Canada. The broader distribution within North America is poorly documented due to limited collection and observation records.

As a member of Crossocerus, the species likely provisions nests with paralyzed aphids (Aphididae), though this has not been directly documented for C. harringtonii specifically. Adults may visit flowers for nectar.

As a predator of aphids, members of this genus contribute to natural aphid population control. The ecological role of this specific species is inferred from genus-level characteristics but not directly documented.

• Crossocerus nitidiventrisOverlaps in western North American distribution; distinguished by subtle differences in propodeal sculpture and male genitalia structure.
• Crossocerus cressoniSimilar size and coloration; requires examination of clypeal shape and punctation density for separation.
• Other Crabroninae (e.g., Ectemnius, Rhopalum)Similar general appearance as small crabronid wasps; Crossocerus distinguished by aphid prey specialization and specific wing venation patterns.

• solitary wasp
• aphid predator
• Crabronidae
• North America
• data deficient

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life