The sorptive dusts, Dri-Die 67, 2% Dibrom-Dri-Die 67, and 0.05% Pyrethrum-Dri-Die 67 have been found effective against pubic lice, Phthirus pubis (L.) and the sorptive dust 2% Dibrom-Dri-Die 67 has been found effective against head lice, Pediculus humanus capitis De Geer. Pubic lice exposed to Dri-Die 67 and 2% Dibrom-Dri-Die 67 were dead at the end of 2 hours. The lice exposed to the former compound lost 47.22% body moisture and those exposed to 2% Dibrom-Dri-Die 67 lost 46.33% at the end of the 2 hour period. The untreated controls lost no weight in this period of time. Male college students infested with pubic lice and treated with sorptive dusts for the control of the lice, were free of them by the end of the third post-treatment day. One application appeared to be sufficient to control the lice. A heavy infestation of nits of the head louse was brought under control when the female patient's head was treated with 2% Dibrom-Dri-Die 67. The compound caused the nits to become deflated and depressed. None of the patients treated with the dusts was adversely affected by them.