Wilcox
Guides
Cophura powersi
Cophura powersi is a species of robber fly in the family Asilidae, described by Wilcox in 1965. The species was named in honor of entomologist Jack Powers, who collected the type specimens in the Dakotas. It belongs to a genus of robber flies that are primarily found in western North America.
Efferia apache
Efferia apache is a species of robber fly in the family Asilidae, described by Wilcox in 1966. The genus Efferia comprises predatory flies known for their aggressive hunting behavior. Records indicate this species has been observed in western Texas, specifically in juniper chaparral habitat at Gold Mine Canyon in Val Verde County. Adults have been collected at mercury-vapor lights, suggesting nocturnal or crepuscular activity patterns. The species name "apache" likely references the Apache peoples or geographic regions of the southwestern United States.
Efferia cabeza
Efferia cabeza is a species of robber fly in the family Asilidae, described by Wilcox in 1966. The genus Efferia belongs to a group of large, predatory flies commonly known as robber flies, which are characterized by their robust build, large eyes, and predatory behavior. Members of this genus are primarily distributed in the Americas. The species epithet "cabeza" (Spanish for "head") may allude to distinctive head morphology, though specific diagnostic features for this species remain poorly documented in accessible literature.
Efferia davisi
Davis Hammertail
Efferia davisi is a species of robber fly in the family Asilidae, first described by Wilcox in 1966. It belongs to a large genus of predatory flies commonly known as 'hammertails' due to the swollen male genital capsule. The species is part of the diverse Nearctic fauna of Efferia, which contains numerous species distributed across North America. Like other robber flies, E. davisi is an aerial predator that captures other insects in flight.
Efferia mortensoni
Portal Hammertail
Efferia mortensoni is a species of robber fly in the family Asilidae, described by Wilcox in 1966. It is known by the common name "Portal Hammertail." Like other members of the genus Efferia, this species is a predatory dipteran that likely hunts other insects. The species name suggests a connection to the Portal area in southeastern Arizona, a region well-known among entomologists for its exceptional biodiversity. Robber flies in this genus are typically active during daylight hours and are often observed perching on vegetation or the ground while hunting.
Heteropogon chiricahua
A species of robber fly in the family Asilidae, described by Wilcox in 1965. The specific epithet "chiricahua" refers to the Chiricahua Mountains of southeastern Arizona, suggesting a geographic association with this Sky Island region. As with other members of the genus Heteropogon, this species is presumed to be a predatory fly, though specific observations of its behavior and ecology remain undocumented in available sources.
Laphystia utahensis
Laphystia utahensis is a species of robber fly in the family Asilidae, described by Wilcox in 1960. The genus Laphystia belongs to the diverse asilid fauna of North America, with this species distinguished by its specific epithet referencing the state of Utah. Robber flies in this genus are predatory insects that capture other arthropods in flight.