Emerald cockroach wasp (Ampulex compressa) head. Coloured scanning electron micrograph (SEM) of the head of an emerald cockroach wasp (jewel wasp), showing one of its large compound eyes (oval, centre-left) and large mouthparts (lower centre). This wasp uses a live cockroach as a host for it larvae. It stings the cockroach to immobilise it and then lays its eggs within its body. It is found in the tropical regions of South Asia, Africa, and the Pacific islands. Magnification: x25, when printed 15cm wide.