Sprays and dusts containing DDT were highly effective in controlling bedbugs, Cimex lectularius and C. hemipterus, in jar, cage, and practical tests. Although a number of effective solvents and concs. of DDT have been found, 5% in crude kerosene is probably the most satisfactory to use and can be expected to give complete mortality for a longer period if applied in the form of a coarse spray using at least 100 mg. of DDT per sq. ft.