Natural host.—"Kakkerlac," Philippine Islands (Sonnerat, 1776): Nesting sites are readymade crevices. The wasp seizes the cockroach by an antenna and stings the host many times in the "abdomen." She drags the cockroach by an antenna to the nest, and, after depositing her egg, plugs the opening with moistened earth.
Dolichurus bicolor Lepeletier
Synonymy.—Schulz (1912) considered this to be Dolichurus corniculus. Berland (1925) stated that this is possibly a color variety of D. corniculus. Soyer (1947), from a study of the behavior of the wasps, believed that both D. bicolor and D. haemorrhous are varieties of D. corniculus. Krombein (personal communication, 1956) stated that D. corniculus and D. bicolor differ in characters other than color alone and that D. bicolor is considered a valid species today.
Natural host.—Cockroach, France (Benoist, 1927): The wasp was observed closing the entrance to its burrow. Its egg was attached to the coxa of the midleg of the cockroach.
Maneval (1932) stated that D. bicolor is found at the edge of dry woods along with D. corniculus and that the wasp will also accept the prey of D. corniculus if presented to it.
Dolichurus corniculus (Spinola)
Synonymy.—Dolichurus haemorrhous Costa [Schulz, 1912]. Berland (1925) listed D. haemorrhous separately but stated that it is perhaps a color variety of D. corniculus.
Natural hosts.—Blattella germanica, France (Benoist, 1927).
Ectobius lapponicus, Germany (Sickmann, 1893); Denmark (Nielsen, 1903); Sweden (Adlerz, 1903); Italy (Grandi, 1931, 1954); France (Benoist, 1927; Maneval, 1928).