In screening tests against three species of poultry lice, the shaft louse (Menopon gallinae (L.)), the chicken body louse (Menacanthus stramineus ((Nitz.), and the wing louse (Lipeurus caponis (L.)), and the northern fowl mite (Ornithonyssus sylviarum (C. & F.)), 0.025% to 1% sprays were applied to individual birds and the litter was treated with ¼ to 1 pound of 4% or 5% dust per 42 square feet. Co-Ral® (O-(3 chloro-4-methylumbelliferone) O, O-diethyl phosphorothioate) gave results comparable to malathion in spray tests at the 0.1% level. Sevin® (1- naphtyl-N-methyl carbamate) and dicapthon appeared to be the most efficient litter treatments.