An Orange and Brown Large Robber Fly Tribe Stenopogonini (Member of Family Asilidae) Perched on Vegetation Waiting for Prey in Eastern Colorado

Very Large Ospriocerus aeacus Black Robber Fly with Bright Orange Abdomen Perched on Vegetation in Eastern Colorado

Promachus Robber Fly with Large Green Eyes Holding a Thick-headed Fly (Conopidae) that it Has Captured and Killed in Eastern Colorado