Abstract
Approximately 150 chemical compounds were tested in the laboratory for their attractiveness to the adults of Limonius (Pheletes) canus Lec. and L. (P.) californicus Mann. Fourteen of the most attractive compounds, as well as four others, were used in traps in the field. Some of the fatty acids–namely, caproic, lactic; butyric, and valeric–appeared to be sex attractants.