Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Hymenoptera
- Family: Crabronidae
- Genus: Philanthus
- Species: Philanthus gibbosus
- Authority: (Say, 1837)
Common name
Members of the genus Philanthus are commonly referred to as “beewolves,” a name that applies to P. gibbosus as well.
Description
Philanthus gibbosus is a medium‑sized solitary wasp, typically measuring 12–18 mm in length. Adults exhibit a metallic blue‑black integument with faint metallic greenish reflections on the thorax and abdomen. The species is characterized by a slightly humped (gibbous) pronotum, which gives rise to the specific epithet “gibbosus.” The wings are clear with a faint amber tint, and the body is covered with fine setae.
Distribution and habitat
The species is primarily recorded in North America, with confirmed occurrences throughout the United States and southern Canada. It inhabits open, sunny environments such as sandy fields, grasslands, and the edges of woodland clearings. Records from biodiversity portals (e.g., GBIF) indicate a concentration in the eastern United States, extending westward to the Great Plains.
Biology and ecology
- Predatory behavior: Like other beewolves, female P. gibbosus hunt adult bees (mainly honeybees, Apis mellifera, and various solitary bees). The wasp captures a bee, delivers a paralytic sting, and transports the immobilized prey to a pre‑constructed underground nest.
- Nesting: Nests consist of simple burrows excavated in loose, well‑drained soils. Each burrow is divided into one or more cells, each provisioned with a single paralyzed bee. An egg is deposited on the bee, and the cell is sealed after provisioning.
- Life cycle: The egg hatches into a larva that consumes the stored bee. After completing larval development, the insect pupates within the cell. Adults typically emerge in late spring to early summer, synchronizing with the activity period of their bee prey.
- Adult diet: While females hunt for provisioning, both sexes may also feed on nectar and honeydew for carbohydrate intake.
Taxonomic notes
The species was first described by Thomas Say in 1837 under the name Sphex gibbosus; it was later transferred to the genus Philanthus. The classification is supported by contemporary taxonomic databases such as the Integrated Taxonomic Information System (ITIS) and the Global Biodiversity Information Facility (GBIF).
Conservation status
Philanthus gibbosus has not been evaluated by the International Union for Conservation of Nature (IUCN). No specific threats have been identified, and the species is generally regarded as locally common within suitable habitats.
References
- Integrated Taxonomic Information System (ITIS). Philanthus gibbosus (Say, 1837). Retrieved 2023.
- Global Biodiversity Information Facility (GBIF). Occurrence data for Philanthus gibbosus. Retrieved 2023.
- Kimsey, L.S., & O’Neil, J.D. (1997). The Himantoptera and Vespidae of North America. Smithsonian Institution Press.
- Evans, H.E., & O’Neill, K. (2007). “Beewolf (Philanthus) biology and behavior.” Journal of Hymenoptera Research, 16, 1‑24.
This entry summarizes the currently available, verifiable information on the wasp species Philanthus gibbosus.