The true spider Steatoda triangufosa ( Walck.) was reared on Spodoprera iittoraiis larvae under different four photoperiods 1. 8. 16 and 24 hours at 25 1- 1°C and 65 % RH .The shortest incubation period was 11.24 days and ranged between 8- 12 days with 1 hour photo period . the longest period was 14.22 and ranged between 13-16 days with 8 hours photo period. The highest rate of egg hatching was 9?.8 % occurred with 24 hours photo period and the lowest was 94.4 % with 8 hours. For the total duration of immature stage, the total immatures period of females was longer than that of males . The longest period of males occurred with 1 hour. Photo period with an average of 82.4 days and the shortest period observed with 16 hours photo period with an average of 50 days . For females. the longest period was 89.? days with 1 hour. and the shortest was 56.0 days with 16 hours photo period . For longevity, female longevity was longer than that of male . The longest periods of pre- oviposition , oviposition and post-oviposition were obtained on 16 hours with an average of 14.4 . 58.43 and 40.2 days. reSpectively . For fecundity , the highest fecundity occurred with 16 hours. followed by 8 . 24 and 1 hour, respectively. Female deposited the highest number of oothecae with an average of 6.4 I female correlated with the highest number of eggs with an average of 106.24 eggs! female with 16 hours . On the other hand . the lowest number of oothecae 3.2 oothecae I female correlated with the lowest number of eggs laid 41.12 eggs occurred with 1 hour photo period .