This paper completes the study of the life cycle ofSteatoda retorta, which was published before (González, 1987). The dates given in this paper were obtained from specimens reared in laboratory. Variations of mortality, survivorship and mean life expectation were studied. The survivorship curve indicates that the experimental population was affected by mortality since age 4 to 9 being this a critical period because the nymphs moult from I to II and from II to III instars. The curve shows another critical period when the population moults to adult stage. The mean life time of the cohort was 37.09 weeks. These results were compared with the data recorded forL. mirabilis, L. antheratus, L. corallinus, L. diaguitaandTidarren sisyphiodes. This analysis showed differences as: a) The survivorship curve ofSteatoda retortais more convex than the others because there is no differential mortality between males and females, b) The higher value of the mean life expectation inSteatoda retortaoccurs when the first critical period finished (II, III instars). In the species ofLatrodectusandTidarren sisyphoidesthis occurs when the populations are at adult stage, c) The value of the mean life time of the cohort and the life cycle is higher inSteatoda retortathan in the other species.