Abstract
ABSTRACT The responses of the red wood ant, Formica rufa, to an artificial trail were examined in darkness in a controlled laboratory environment using a satiated colony. Artificial trails were prepared in four different solvents from the head, thorax+legs, and gaster extracts of foragers. Thorax+legs extracts did not elicit directional responses in foragers. Gaster extracts were consistently followed, suggesting that trail-following is induced by pheromones issued from gastric glands. Head extracts were also followed, but foragers displayed excitement, most probably in response to an alarm message.
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