the pennsylvania wood cockroach has three developmental stages: egg, nymph, and adult. eggs are laid in egg capsules, produced during the warm months and deposited behind the loose bark of dead trees, fallen logs, or stumps. egg capsules are yellowish brown and characteristically curved on both sides like a half moon. capsules are twice as long as wide, each containing up to 32 eggs. the egg stage lasts about 34 days at 80 °f, while the nymphal stage typically lasts 10 to 12 months but can last up to 2 years. the normal life span of the female adult is several months.