Abstract
Nymphal development and adult longevity were examined in three populations of the Australian wood-feeding cockroach Panesthia cribrata Saussure. The sizes of nymphs and the rates of increase in size between molts were found to vary greatly between individuals, broods, and populations. Evidence of polymorphism was observed in all populations. Nymphal development was calculated for two populations from field and laboratory data. In one, development was estimated to take at least 6 yr and encompass 12 instars. For the other population, the respective estimates were at least 4 yr and 9 instars. Adult longevity was calculated to exceed 4 yr. The characteristic patterns of growth of nymphs from each population were found to be relatively constant, even when all specimens were cultured under identical laboratory conditions.
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