Mean walking time (± SD; n = 50) of naive females of Theocolax elegans in a four chamber olfactometer. LF: areas above Petri dishes with faeces of S. zeamais larvae, MF: areas above Petri dishes with faeces of S. zeamais males, FF: areas above Petri dishes with faeces of S. zeamais females, C: areas above control Petri dishes. Bars with different letters are significantly different at P < 0.05 (Friedman ANOVA followed by Wilcoxon-Wilcox-test for multiple comparisons).