This insect has been found in the Great Sand Dunes and surrounding habitat. It is one of the largest insects documented from the area, measuring nearly 1' (2.5 cm) in length. Robber flies do not seem to have a preference for a particular type of sandy habitat; they have been encountered in sand/grass, sand/shrub, and even bare sand environments. Robber flies are often observed foraging on other flying insects (wasps, bees, and flies) during the heat of the day, after all crawling insects have taken cover from the extreme heat of the sand.