The effect of temperature on the rate of development of Trissolcus oenone was determined by rearing individuals on eggs of Biprorulus bibax Breddin under a range of constant temperatures (12.5-35.0OC).Rates of development changed in a linear fashion over a wide range of temperatures. The lower developmental threshold was estimated to be 12.4"C and an estimated 165.5 degree-days were required for egg-adult development. Survival of developing parasitoids ranged between 60-90Vo at most temperatures.Wasps produced progeny at all temperatures between 15-35 "C and total production of offspring ranged from 55.9-163.1. Greatest fecundity occurred at 17.5, 22.5 and 25°C. Longevity did not differ between virgin and mated females and was greatest at 17.5OC (46.7 d) and least at 32.5"C (11.7 d).

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