The effect of several constant temperatures on the ability ofCompsilura concinnata(Meigen) to increase in numbers was studied in the laboratory for the purpose of maximizing production in a mass-rearing program. Successful development from 1st-stage larva to adult occurred within a temperature range of 15.6°–29.4°C. At 32.2°C, the highest temperature tested, adult flies failed to emerge. Percent parasitism and adult emergence were greatest between 15.6° and 23.9°C. Mean number of puparia/host was highest in larvae exposed between 18.3° and 26.7°C. Both larval and pupal development time varied inversely with temperature within the range of 15.6°–26.7°C. Longevity and duration of both prelarviposition and larviposition were inversely related to temperature. Production of puparia from individual females was variable. Males were capable of multiple mating and effectively fertilized as many as 6 ♀.