microecobus:libutron:Elegant lady | ©Nikola Rahme Rhamphomyia marginata is an Eu
microecobus:libutron:Elegant lady | ©Nikola Rahme Rhamphomyia marginata is an European dance fly belonging to the family Empididae. This species exhibits one of the most striking examples of female ornamentation in the Empidinae. Males of R. marginata have black ground color with grey dusting on thorax and abdomen, brownish stripes under dorsoventral setae, and wings clear. In contrast, female (pictured) has wings greatly broadened (approximately 1.6 times the area of the male wings), with posteroapical margin straight, and a wide brown band around wing margin [1]. This species also shows sex role reversal. Unlike other species of dance flies which often form male mating swarms, females of Rhamphomyia marginata gather to swarm, while males carrying a prey visit swarms for mating [2]. Coolest butterfly -- source link