Light traps have long been used to indicate cutworm moth population, but a survey of the literature reveals no instance in which light trap catches have been compared with any other source of information regarding the moth population. It has apparently been assumed by all workers, the writer included, that a light trap record furnished a reliable random sample of the population. Certain data have recently accumulated, horvever, which make it desirable to question this assumption, and some of these data will be presented here.