The following information is from Parker and Thompson (1928): Adult behavior.—Courtship and mating were accomplished as soon as adults emerged, and in a manner similar to that in other chalcids. The females oviposited only into oöthecae that were parasitized by Zeuxevania, never into normal, nonparasitized oöthecae. Oviposition.—Oviposition occurred two days after mating. The female wasp stroked the oötheca with her antennae, selected a site, and bored into the oötheca with her ovipositor. She inserted the ovipositor deeply and oviposited for 10-30 minutes. The eggs were deposited randomly on the evaniid larva, some upright and others lying down. Development.—Eggs of the hyperparasite hatched within 3 days and the larvae commenced feeding on the host larva. There were 30 and 50 hyper-parasites in two oöthecae. Sex ratio.—5 ♀♀:1 ♂ (from 3 oöthecae).
Distribution.—U.S.A., District of Columbia, Maryland (Burks, 1952).
Tetrastichus australasiae Gahan
Natural host.—Periplaneta australasiae, Sumatra (Gahan, 1923).
Tetrastichus hagenowii (Ratzeburg)
Synonymy.—Entedon hagenowii Ratzeburg, Blattotetrastichus hagenowii (Ratzeburg) [Burks, 1943]. Tetrastichodes asthenogmus Waterston. G. J. Kerrich (personal communication, 1957) compared the type of Tetrastichodes asthenogmus Waterston with authentically determined material of Tetrastichus hagenowii and concluded that T. asthenogmus is only a weakly developed specimen of T. hagenowii. He stated, "The longitudinal dorsal grooves of the scutellum, which are strongly developed in normal hagenowii, are only rather faintly developed in Waterston's type and also the second specimen, which was dissected and mounted on a series of ten microscope slides. No doubt it was this faint development that caused Waterston to describe the species in Tetrastichodes, a segregate that has since been recognized by Dr. Burks (Proc. U. S. Nat. Mus., 1943) as being not truly generically distinct from Tetrastichus."
Natural hosts.—Blatta orientalis, Seychelles (Ratzeburg, 1852); India (Usman, 1949).
Blatta sp., U.S.A., Louisiana (Gahan, 1914).
Blattella germanica (Burks, 1943; Peck, 1951). [In personal communications, Burks and Peck cite Howard (1892) and Marlatt (1902, and the 1908 revision of 1902) as sources for this host record. However, B. germanica is not mentioned specifically as a host of T. hagenowii in the sources cited nor in the 1915 revision of Marlatt's 1902 paper cited by Burks (1943); see footnote 6, p. [236].]
Neostylopyga rhombifolia, Hawaii (Pemberton, 1941): This record is based on one parasitized oötheca. We have exposed, at three different times, groups of 10 to 20 oöthecae of N. rhombifolia to many newly emerged T. hagenowii, but none of the eggs was parasitized (Roth and Willis, unpublished data, 1957).