Ruby-tailed wasp (Chrysis ignita) is a species of cuckoo wasps: these are. kleptoparasites laying their eggs in the nests of other wasp species where their young consume the eggs or larva of the host wasp for sustenance.

Chrysis ignita parasitizes mason bees in particular. Ruby-tailed wasps have metallic, armored bodies, and can roll up into balls to protect themselves from harm when infiltrating the nests of host bees and wasps. Unlike most other Hymenopterans, cuckoo wasps cannot sting. Chrysis ignita is found across the European continent.

Podere Montecucco, Orvieto, Italy. August 2021