The problems of how to obtain accurate records of the infestation of injurious insects has during recent years received considerable attention; and when we take into consideration that it is quite as impossible to study the course of an outbreak during its different stages as it is to compare two outbreaks occurring in different localities or at different times, without possessing methods of recording in an accurate way the degree of infestation and injury, it is evident that every effort must be made to solve this difficulty and devise means of obtaining accurate records in these respects.