Rainieria antennaepes is a species of stilt-legged flies in the family Micropezidae found in North America east of the Rocky Mountains. The name "antennaepes" means "antenna foot". They frequently hold their white-tipped front legs up and wave them around in a manner that makes them appear like the antennae of ichneumonid wasps. They feed on detritus, bird droppings, and similar waste.