Elaterids of the species Agriotes lineatus (L.), which were collected in heap-traps (at Stenum, Skara, West Sweden) during the period May 9-24, I972, were sorted according to sex. The abdomens of the males and females respectively were crushed in 95 % ethyl alcohol for the extraction of possible pheromones. The unfiltered fluid was tested in pitfall traps placed in a field of oats. During the period May II - July 3, I70 A. lineartus were obtained of which I62 were males. The majority of these were caught in the traps baited with female extract. The male extract caused no response. The female extract must therefore have contained a sex pheromone which attracted males of the same species.