Relative abundance of 27-MeC39-14-ene and 27-MeC39-16-ene in Cr. modiglianii workers living with the red vs. Cr. modiglianii workers living with the black Ca. rufifemur variety. Median, quartiles, range, and outliers (i.e. all data points deviating from the box by more than 1.5 times the interquartile range) are shown in the present and the following figures. The number of analyzed colonies is given above each plot. ** highly significant (p = 0.0043) according to U test.