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mortality, The prenatal mortality was referred to as the reduction in fecundity from the potential te the realized fecundity. This involved the reduction due to the weight loss ef female adult determined indirectly by the population density during the nyrnphal stages and the one directly induced by the adult interference. The reduction in fecundity was greater by far in the adult stage, that is, the interference among the adults. A considerable proportion of fernales died without laying their eggs. A devise was proposed to estimate the number of barren females in the population incorporating the life span of females and their mating frequency. It was suggested that 23-35 per cent of the females of the lst and 2nd generations were barren. The egg rnortality and the nymphal mortality from hatching to the end of the 4th instar occurred dependently on the population densities of eggs and hatchlings. The mortality of the 5th instars tended te be low when the mortality of nymphs prior to the 5th instar was high. A great yariation in the rnean fecunclity of prolific females was noticeable among the generations:the highest one was 51 times as much as that of the lowest. It was concluded that the prenatal mertality contributes mostly te

applied entomology and zoology

The Study on the Regulatory System of the Population of the Southern Green Stink Bug, Nezara viridula L.(Heteroptera : Pentatomidae) under Semi-Natural Conditions