Chrysididae.-- Cuckoo wasps are small insects, rarely over 11 mm long. Their color is metallic green or blue, and usually the body is coarsely sculptured. They resemble some of the chalcids and bees in size and coloration, but a more complete venation in the front wing but no closed cells in the hind wing distinguish the cuckoo wasps. Also the structure of the abdomen is distinctive and has only 3-4 visible segments and is hollowed ventrally. When a cuckoo wasp is disturbed, it usually curls up in a ball. Most species are external parasitoids of full-grown wasp or bee larvae; the species in the genus Cleptes attack sawfly larvae, and those in Mesitiopterus attack the eggs of walking sticks (Borror et al., 1989).