Aphilanthops hispidus

Distinguished from congeneric species and similar beewolf wasps (Philanthus) by straight inner eye margins. Aphilanthops hispidus is one of four species in the genus Aphilanthops, all restricted to North America including Mexico. In the southwestern United States, it is the most commonly encountered species of the genus, particularly abundant on Baccharis salicifolia flowers in August and September. Positive identification to species level typically requires examination of morphological details not visible in field observations.

Medium-sized solitary wasp with straight inner eye margins that distinguish it from the related beewolf wasps (Philanthus), which have notched inner eye margins. The species name "hispidus" refers to a hairy or bristly appearance. Overall coloration and detailed morphological features require direct specimen examination.

Open habitats with sandy or loose soils suitable for nest excavation. Documented in association with riparian vegetation including seepwillow (Baccharis salicifolia) stands. Nests are constructed in flat or gently sloping sandy soil.

North America, including the southwestern United States (Arizona, New Mexico) and Mexico. The species has been specifically documented as abundant in Arizona during late summer months.

Adult activity observed primarily in August and September in Arizona. This timing coincides with the late summer flowering period of Baccharis salicifolia, a major nectar source.

Adults feed on nectar from flowers, particularly Baccharis salicifolia (seepwillow). Larvae are provisioned with paralyzed winged queens of ants in the genus Formica.

• Formica - preyWinged ant queens paralyzed and stored as larval food
• Baccharis salicifolia - nectar sourceAdults abundant on flowers in late summer

Females excavate individual nest burrows descending at approximately 45 degrees, terminating in a waiting room 12-25 cm below the surface. Up to four ant queen victims are stored temporarily while additional brood cells are constructed 23-45 cm underground. Each brood cell receives 2-3 ant queens with a single egg laid on one victim. The number of brood cells per nest is unknown. After provisioning, the burrow entrance is filled with soil.

Females hunt winged ant queens during colony swarming events, which typically occur once annually. Prey may be attacked upon emergence from nests or after landing from nuptial flights. Wings are detached from ant queens before storage in burrows. Prey is transported by flight to the nest threshold, inspected, then dragged underground by an antenna. Multiple females often nest in close proximity, though competitive interactions for prey are not documented.

Predator of ant queens, potentially influencing local ant colony establishment and population dynamics. Nectar feeding contributes to pollination of flowering plants. Serves as host for parasitic satellite flies (family Sarcophagidae).

No documented direct economic or medical importance. Of interest to entomologists studying specialized predator-prey relationships and solitary wasp biology.

• PhilanthusBeewolf wasps share family Crabronidae and subfamily Philanthinae; distinguished by notched (emarginated) inner eye margins versus straight margins in Aphilanthops
• Aphilanthops frigidusCongeneric species with broader North American range; differs in seasonality (active June-August in northeastern North America) and habitat preferences

• solitary wasp
• ant predator
• ground-nesting
• specialized predator
• nectar feeder

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Bug Eric: Wasp Wednesday: Ant-queen Kidnappers
• Oedemeridae | Beetles In The Bush