Predatory arthropods were collected from cotton interplanted with corn and sorghum. Collections were made on rows 1, 5, 9, 13, 17, and 21, as one moved away, both north and south, from the grain crops. Predators collected in the greatest numbers were lady beetles, lacewings, nabids, and hooded beetles,Notoxus monodon(F.).No linear or directional effects could be determined in conjunction with the total predator population. On Aug. 23 the lady beetle and lacewing populations exhibited a linear decrease as one moved away from the grain crops.The predator population and percentHeliothisdamaged squares was greatest on the 1st row north of the grain crops.There was a significant difference in yield among the rows (5% level). The yield decreased as one moved away from the grain crops and 78% of this decrease could be attributed to linear effects. The drop in yield amounted to 2.27 lb of stripper cotton per sampling unit or 57.04 1b per acre.