Life tables and tables of age-specific fecundity were constructed for the predaceous bugXylocoris flavipes(Reuter) for temperatures ranging from 20 to 35°C and for relative humidities ranging from 32 to 98%. These tables were used to calculate the innate capacity for increase, the finite rate of increase, the generation time, the gross rate of reproduction, and the net rate of reproduction. the results indicated thatX. flavipesis capable of population increase over nearly the entire range of temperature and humidity examined. The optimum conditions for increase lie between 29 and 31°C and between 60 and 80% RH.