The present paper deals with the relationships among temperature and the development, survival, sex ratio, body weight and reproduction of the Cockroach (0. orientalis)at five constant temperatures from 19?to 31 ℃. The rates of development of the nymphal stage of the cockroach were determined at five constant temperatures and fitted to logistic curve. The number of instars of nymph differed with the temperature and had relation to sex. Under the same temperature, the number of instars of male was less than ...