Sprays composed of benzene hexachloride wettable powders at 0.17% gamma content were efficacious against chicken lice, but were irritating to the operator and too malodorous for practical use. The odor was materially reduced when benzene hexachloride extracts of 1.27 to 1.55% [gamma] content were produced from No. 2 fuel oil or Ultrasene. Such formulations applied on roosts with an oil can or paint brush are generally effective against chicken lice when used at 1-3.3 ml. per lineal foot of roost space. No evidence was secured indicating that benzene hexachloride-fuel oil solns. of 1.27% [gamma] content, applied at 1.5 ml. per lineal foot of roost space, tainted either eggs or dressed chickens. Benzene hexachloride proved effective against sheepticks or keds, cattle lice, hog lice, chicken mites and wool maggots. The compound shows considerable promise when employed in lanolin ointments or linseed oil solutions against demodectic mange of cattle. Water suspensions were less promising.