Supplementary Video 1: A Photinus pyralis courtship dialogue

A P. pyralis male (right) signals to a female on a leaf (center) as competitor males flash in the background. The male demonstrates the characteristic P. pyralis swooping “J” flash every ~5 seconds. The female demonstrates the characteristic abdominal rotation toward the male and delay in flash reply. Footage taken during summer 2012 in Jackson Co., Tennessee, USA by Sarah E. Sander Lower