Abstract: Results of laboratory studies showed that three cockroach species, Periplaneta fuliginosa, F. japonica and P. americana could be used as hosts for mass propagation of Tetrastichus hagenovii, but not with Blatella germanica. The parasitization by and egergence rates of the parasitoid were 45.08% and 11.69% in P. fuliginosa; 53.66% and 28.57% in P. japonica; and 64.04% and 47.19% in P. americana, respectively. The average developmental period of the parasitoid in the egg-cases of the three host species was 64V63, 66.79 and 48.38 days, respectively. These suggested that the American cockroach be a better host for the laboratory mass propagation of T. hagenovii.