Parthenogenesis has been considered rare among cockroaches (Chopard, 1938), but, as Chopard (1948) later pointed out, fewer observations have been made on these insects than on other Orthoptera. However, a number of workers have attempted from time to time to determine whether some of the common, cosmopolitan species of cockroaches can reproduce without fertilization of the eggs. Most of the results have been negative, the writers claiming that either no eggs are deposited by unfertilized females, or if eggs are laid, they fail to develop. Unfortunately, many of these observations were based on small numbers of individuals; the length of the experimental periods were too short; or hatching of eggs was used as a criterion of parthenogenesis; therefore, many facts concerning parthenogenesis in cockroaches were not elucidated.