In this paper are described in considerable detail the methods of collecting and rearing soil-infesting cutworms which several years experience has shown to be the most suitable and efficient, under Saskatchewan conditions, for securing accurate estimates of the relative (and to some extent the actual) abundance of the cutworm species involved, and the abundance and effectiveness of their various insect parasites and diseases. An attempt is made to distinguish between those methods which are essential under nearly all circumstances, and those which, though non-essential, should be employed when conditions permit. A few instances are cited illustrating the working out of these methods in actual practice. Three general conclusions are drawn. 1. Each cutworm must be kept isolated from the moment of collection and be reared with such precautions as will minimize the subsequent effects of the changes or conditions or the possibilities of cross infection. The employment of this technique, more than any other point in the procedure, conditions the entire results. 2. The methods of collecting must be so systematized as to make each collection truly representative of its immediate location. 3. More valuable returns are secured, for the efforts expended, by making several successive or otherwise comparative small collections rather than a few large ones.