Article révisé par les pairs
Résumé : ABSTRACT. The mandibular glands of Myrmica ants contain, among other substances, 3‐octanol, a chiral substance, 90% of it being the R‐enantiomer in M. scabrinodis Nyl., ruhra L. and ruginodis Nyl. (Cammaerts et al., 1985). Pure R and S 3‐octanol has been prepared and tested on M. rubra and scabrinodis, workers. Both species react specifically only to the R enantiomer; in M. rubra this constituent arrests foragers briefly, and in M. scahrinodis it attracts them and incites them to walk more quickly. It is shown that, in M. scahrinodis, the naturally produced mixture of R and S 3‐octanol (proportions of 9:1, v/v) is more active than the pure R enantiomer or a mixture of R and S 3‐octanol (5:5 v/v). Copyright © 1987, Wiley Blackwell. All rights reserved