Abstract: Courtship represents one of the most studied sexually selected behaviors in the animal kingdom, but relatively little work has been done to determine the effect of social environment on male courtship behavior.  This study looked at a wild population of forked fungus beetles (Coleoptera: Tenebrionidae: Bolitotherus cornutus) to investigate how the courtship behavior of males correlated with phenotypic measures of the social environment at the time of the courtship. A significant positive relationship was found for the mean elytral length of female social partners.  Temperature explained a significant amount of the variance for male courtship behaviors with a male social environment, but there is possible multicollinearity with other model factors.  This study is the one of the first to show that the phenotypes of the social environment can elicit an audience effect on courtship behavior (i.e. interacting phenotypes) in the wild.