The longevity and fecundity of the parasitoidDiglyphus intermedius(Girault) and the host mortality induced by the parasitoid were studied at five constant temperatures from 15.6 to 31.1°C. Third instars ofLiriomyza trifolii(Burgess) were provided as hosts. The median longevity (L50) of the adult female at temperatureT(°C) is described by the equation 1/L50=e0.088(T−47.98)−1. The predicted lifelong total number of eggs (F) per female is given by the equationF= −196.11 + 42.65T− 1.1T2, and the lifelong total number of hosts killed (Hm) is given by the equationHm= 721.97 – 19.1T. The cumulative distributions of adult longevity, host mortality, and fecundity in relation to physiological age are described.