Leucospidae

Definition

A family of robust, often bee-mimicking parasitoid wasps in the superfamily Chalcidoidea. Adults are typically black with yellow, red, white, or metallic markings; females possess a diagnostic recurved ovipositor that lies dorsally along the metasoma when elongated. Larvae are ectoparasitoids of aculeate Hymenoptera—primarily bees (Megachilidae, Apidae) and sphecid or vespid wasps—developing on the host larva or prepupa within its sealed cell. The hind femora are enlarged and toothed, and the wing folds longitudinally at rest.

Etymology

From Greek leucos (white) + spis (wasp), referring to the pale markings of some species.

Example

Leucospis affinis, a North American species, parasitizes leafcutter bees (Megachile) by inserting its recurved ovipositor through the leaf-plugged nest entrance to reach the host brood cell.

Related Terms

• Chalcidoidea
• ectoparasitoid
• Aculeate
• Megachilidae
• Sphecidae
• ovipositor
• mesosoma
• metasoma
• mimicry
• Hymenoptera

Usage Notes

Distinguished from the superficially similar family Chalcididae by the dorsally recurved ovipositor and the longitudinal wing fold. The family is small (~5 genera, ~130 species) but cosmopolitan. Adults are often mistaken for bees or stinging wasps due to their robust build and aposematic coloration; this mimicry is considered protective, as Leucospidae cannot sting.