Mesosoma length versus tergite 3 slenderness (length/width) of 107 male rhyssine wasps. No species showed a significant increase in slenderness with body size (linear regression, statistics in top margin). This suggests the males of these species do not scramble for emerging females. The one exception was Epirhyssa overlaeti, whose tergites got significantly more slender with body size when the significance was estimated by one-tailed correlation (p-values marked with †) instead of linear regression.