Abstract: Chrysonomyia formosa(Westwood) is a predominant parasitoid on the vegetable leafminer, Liriomyza sativae Blanchard. The bionomics of C. formosa was studied in the laboratory. With the increase of temperatures from 17℃ to 35℃, adult wasps emerged earlier, emergence time of adult was more concentrated, the peak of emergence advanced, and the longevity of the adults was shortened gradually. Feeding with water, the longevity of female was prolonged significantly when host larvae were provided than when host larvae not provided. Provided with host larvae the longevity of female wasp was prolonged significantly feeding on 10% honey liquid than those feeding on water. Female C. formosa preferred the 3rd instar larvae oL. sativae The mortality and parasitism on the 3rdinstar larvae of host were higher than on the 1stinstar and 2ndinstar larvae. The sex ratio of offspring was 5.11(F) ∶ 1(M) when the 3rdinstar larvae of host were offered for the female wasps. At the range of temperature 17℃ to 35℃, the developmental durations of the wasp were decreased with the increase of temperatures

Key words: Chrysonotomyia formosa, Liriomyza sativae, biological, characteristics, longevity, developmental duration 