Jewel wasp (Ampulex compressa),

The wasp has a metallic blue-green body, with the thighs of the second and third pair of legs red. The female is about 22 mm long; the male is smaller and lacks a stinger.[2] Males can be less than half of a female in size if emerging from a smaller or a superparasitized host.[3] The species undergoes four larval stages, where the initial younger larvae can be seen as external hemolymph-feeders on the paralysed roach's leg, and the last instar feeds internally.[6] Upon pupation it produces a chocolate-coloured, thick, spindle-shaped cocoon which can be found inside the dead cockroach within the burrow.[4]