1, 2, 4-Dithiazolium salts substituted in 3 and 5 positions with Me2N, pyrrolidinyl, or morpholino groups were active as chemosterilants in the male house fly. When combined with one of these substituents, EtZN, piperidino, and substituted pyrrolidinyl groups also gave active compounds. Several other 3, sdisubstituted 1, 2, 4-dithiazolium salts were inactive. Analog of dithiazolium compounds containing 1, Zdithiolium, 1, 2, 4-dithiazole, 1, ...