The longevity of adults of the rusty grain beetle, Cryptolestes ferrugineus (STEPHENS) (Coleoptera : Cucujidae) was determined at-9, 0, 10, 15, 20, 25, 30, 35 and 40°C and 70% relative humdity. The survival rates : at -9°Cbegan to decrease during the 2nd week and was 13% after 7 weeks, at 0°C were more than 90% for the first 6 weeks and was 56% after 11 weeks, at 10 to 30°C ranged from 77 to 97% after 32 weeks, at 35°C was 38% after 32 weeks, and at 40°C decreased to 0% in 6 weeks. Survival rate for females was higher at -9°C and lower at 35°C than that for males, and there were no significant sex differences in survival among the other temperatures. More than 81% of the females that survived at 10 and 15°C for 32 weeks produced viable eggs at a rate of more than 14 eggs per week when transferred to 30°C and 70% RH. Under the same conditions, a smaller proportion of females, which survived for 32 weeks at high temperatures, produced viable eggs at a lower rate.