Yuma
Guides
Efferia yuma
Efferia yuma is a species of robber fly in the family Asilidae, described by Wilcox in 1966. Robber flies in the genus Efferia are among the largest and most charismatic members of the family, often recognized by their impressive size, striking green eyes in males, and predatory habits. The species name "yuma" likely refers to the Yuma region of southwestern Arizona or adjacent California, suggesting an association with arid southwestern habitats. Members of this genus are aerial predators that capture other insects in flight.