Sampling adultPhyllotreta cruiciferae(Goeze) andP. striolata(F.) overwintering in a grove of trees gave estimates of combined mean densities as high as about 2 million beetles per ha. Both species showed a similar aggregated type of distribution. Variation in the numbers of adults obtained among sampling areas suggests that too many samples would be required for winter sampling to be a practical method of estimating flea beetle abundance over large areas.