This work studies for first time the effect of constant temperatures (15, 20, 25, 30 and 3 degrees C) on the demography of Anarsia lineatella Zeller (Lepidoptera: Gelechiidae) based on jackknife and bootstrap randomization methods. Male and female longevity was substantially reduced at the higher temperatures in contrast to intermediate and lower temperatures. According to a second order polynomial regression function, high correlations were observed between temperatures and the age of first reproduction as well as temperature and oviposition times. Net reproductive rate was highest at 25 degrees C and 74.172, while the intrinsic rate of increase displayed its highest values at 30 degrees C and was estimated to be 0.238. Birth rate and finite capacity of increase were higher at 30 degrees C and estimated to be 0.235 and 1.268, respectively. Mean generation time and doubling time varied significantly with temperature and the shortest mean generation and doubling time was obtained at 30 degrees C (25.566 and 2.909 d respectively). Life expectancy had its lowest value 10.3 d at 25 degrees C, whereas cohorts that were maintained at 20 and 15 degrees C increased their life expectation approximately three to sixfold.