Jewel wasp

Definition

A common name for certain metallic, often brilliantly colored solitary wasps in the family Ampulicidae, most notably the emerald cockroach wasp *Ampulex compressa*, celebrated for its sophisticated host manipulation behavior. These wasps typically possess a compact, sculptured body with metallic blue-green or emerald coloration. The term emphasizes visual appearance rather than forming a formal taxonomic group, though it is most consistently applied to ampulicids.

Etymology

From the metallic, gem-like iridescence of the cuticle.

Example

The jewel wasp *Ampulex compressa* delivers a precisely targeted sting to the cockroach's subesophageal ganglion, inducing hypokinesia that allows the wasp to lead the docile host by its antennae to a prepared burrow.

Synonyms

• emerald cockroach wasp
• emerald wasp

Related Terms

• Ampulicidae
• entomophagous parasite
• host manipulation
• hypokinesia
• Subesophageal ganglion
• Parasitoid
• cockroach wasp
• sting

Usage Notes

The term is applied somewhat loosely to any strikingly metallic small wasp, but in entomological usage it most precisely denotes ampulicids, particularly *Ampulex* species. It should not be confused with 'jewel beetle' (Buprestidae) or other metallic insects. The common name emphasizes appearance, not behavior; the behavioral description requires additional qualifiers like 'emerald cockroach wasp'.