Laboratory studies were conducted to compare the toxicity of 7 candidate fumigants with methyl bromide (reference standard) to adults of confused flour beetle, Tribolium confusum Jacquelin du Val and of cigarette beetle Lasioderma serricorne (F.), and larvae of black carpet beetle, Attagenus piceus (Olivier). The insects were fumigated in 19.5-liter bottles at 80° ±4 °F and at a relative humidity of 78 ± 18%, In 24-hr exposure tests 2 propyn 1-01, n-butyl isothiocyanate and Virginia-Carolina 3-676 ( O -methyl S, S -dipropyl phosphorodithioatc) were the only chemicals that were more toxic than methyl bromide at LD93to all 3 insect species.