Systoechus
Guides
Systoechus oreas
Systoechus oreas is a species of bee fly in the family Bombyliidae. It is known from western North America, with records from British Columbia, Canada and the western United States. The larvae are predators of grasshopper eggs, a trait that distinguishes this species ecologically from many other bee flies. Adults are active in the fall, in contrast to the spring-active members of the related genus Bombylius.