Platynota idaeusalis(Walker) males were previously known to be attracted totrans-11-tetradecen-1-ol, and addition oftrans-11-tetradecenyl acetate in a 1:1 ratio increased these catches. Both these compounds have now been found in extracts of female abdominal tips in an alcohol:acetate ratio of about 2:1. Catches of males in field tests were highest when mixtures of 5μl oftrans-11-tetradecen-1-ol plus 5–15μl oftrans-11-tetradecenyl acetate on rubber septa were used as lures. Addition of 10 or 20% of thecisisomer of the alcohol attractant decreased the catch by more than ½, while addition of 20% of thecisacetate decreased attractancy by ¼.