抄録
A "species" of Sumatran epilachnine beetle, which is similar to Epilachna (=Henosepilachna) sparsa DIEKE feeding on Solanum torvum, was reared under laboratory condition to study the survivorship and fertility schedules. The "species A" required 23.4 days for the development of the immature stages. The mean longevity of the males (87.6 days) was longer than that of females (57.7 days). The mean length of the pre-reproductive period (11.0 days) was longer than that of post-reproductive period (2.3 days). The females laid eggs at a nearly constant rate throughout their reproductive period. The reproductive value Vx/V0 remained at a high level for most or adult life, as a result of the prolonged survivorship and fertility schedules. The total number of eggs produced per female was 770.7. The intrinsic rate of natural increase r was 0.125 per capita per day. The demographic traits of this species are similar to those of the two cucurbitaceae feeding Sumatran epilachnine beetles studied earlier, and are different from those of temperate species.
