Abstract The insects used in these tests were the confused flour beetle adults 7-14 days old and black carpet beetle larvae 3-5 mo old. The insects were reared and the tests were conducted in rooms maintained at 27 1 C and 60_5% RH. A Gardner blade applicator was used to apply acetone solutions of the technical formulation insecticides to 3 by 12 inch strips of 40-lb kcaft paper laminated to aluminum foil. Rates of 5, 10, and 50 ugy/cm2 - were applied on the paper, surfaces and 1, 5, and 25 ug/cm2 on the aluminum surfaces for the tests of 1-day-old residues. Rates of 10, 50, and 100 ug/cm2" and 5, 25, and 50 ug/cm2 were applied on the paper and aluminum surfaces, respectively, for the tests of 28-day-old residues. Ten insects were exposed to the residues in each of 4 arenas formed by 6.4 cm dia, by 2.5 cm high, glass cylinders placed on each type of surface. The confused flour beetle adults and the black carpet beetle larvae were exposed on the 1-day-old residues for 4 and 24 h, respectively. Both species were exposed on the 28-day-old residues for 24 h. After exposure, the insects were placed into clean petri dishes without food, The numbers of knocked-down and dead plus moribund insects were recorded after 120 and 168 h for the confused flour beetle adults and the black carpet beetle larvae, respectively. Insects not able to move about freely were classes as knocked-down and those that responded only feebly or not at all when lightly probed were classed as dead plus moribund. Malathion-treated surfaces were used as a standard for comparison for each treatment rate. Acetone-treated surfaces were used as the controls. The insecticidal activity of each candidate insecticide was ranked by comparison with the malathion standard according to the test conditions as follows: 1, equal to or greater than the standard; 0, less than the standard; and -1, little or no insecticidal activity.