Fig. 1. The aggressive response of L. humile to conspecific surface lipids supplemented with n-alkane hydrocarbon standards. L. humile responded aggressively to changes in the relative abundance of n-alkane hydrocarbons in their cuticular hydrocarbon profile. The ants did not respond more aggressively to n-alkanes when presented alone than to the blank control or nestmate surface lipids. Values are means ± s.e.m. (N=8). The line above the bars indicates that LSD post-hoc analysis showed no statistical difference among the treatments.