Longevity and fecundity of adult house flies were determined at constant temperatures of 20, 25, 30, and 35 degrees C. At the four temperatures, respectively, the median mortality rates (1/days to 50% mortality) for females were 0.023, 0.041, 0.060, and 0.099 and for males were 0.029, 0.047, 0.066, and 0.085. The numbers of days for 50% of the eggs to be deposited for each temperature were 34.5, 21.3, 10.2 and 7.1, respectively. The total numbers of eggs deposited per female for each temperature were 184, 729, 709, and 506, respectively. Models were developed for longevity and fecundity and their distributions as functions of temperature.