The so-called citricola scale has been found by Clausen to be synonomous with Coccus pseudomagnoliarum (Kuwana). In California this scale is preyed upon by at least four species of primary parasites, which are the same species attacking Coccus hesperidum Linn. The latter scale is held in check almost entirely by these parasites and it is the opinion of the writer that their lack of effectiveness on the citricola scale is due to the fact that pseudomagnoliarum has but one generation per year while hesperidum, has several. Several hyperparasites are found in connection with the soft brown scale. Biological notes and descriptions of two new parasites are given.