关键词: 黑胸大蠊, 卵荚, 寄生蜂

Abstract: Three oothecal parasites of cockroach, Periplaneta fuliginosa, (Serv.)are discovered in Shangyu County, Zhejiang Province. They are Tetrastichodes sp., Tetrastichus hagenowii (Ratz.) and Evania sp.. T. sp. Is widely distributed in Shangyu. It occupies 86.2 per cent The mixed parasitism rate of T. sp. And T. hagenowii in nature is 64.2 per cent (oothecae being 51.8% and oothecal shell 68.4%). Both are presented in the same biotope. The oothecae may be parasitized in exposed and hidden sites, but the parasitism rate of the former is higher than that of the latter. T. sp. Is estimated to breed 3～5 generations in a year according to the local climate. Such items as the average number of adults emerging from a single ootheca of T. sp. And T. hagenowii, the sexual ratio, the body length, the life span, the mating and the oviposition have been observed and measured. The resalts fully showed that from the biological point of view these two species are of great potential value to controlling local Periplaneta fuliginosa.