Abstract
Life history traits such as adult longevity, fecundity and duration of immature stages have been studied under laboratory conditions in several cassidine species (Albuquerque & Becker, 1986; Habib & Vasconcellos-Neto, 1979; Kosior, 1975; Ward & Pienkowski, 1978). Life table parameters, for example the intrinsic rate of natural increase r, the mean length of a generation T and the reproductive rate V x/V 0, can provide an opportunity for interspecific and geographic comparisons of demographic characteristics. However, the parameters have been derived for few cassidine species (Nakamura et al., 1989 for two Aspidomorpha species in Sumatra), because the survivorship (l x ) and fertility (m x ) schedules throughout life are indispensable for the calculations.
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