Pogonioefferia dubius (Williston)

Lavigne, Robert J. & Dennis, Steve, 2019, Robber flies (Insecta: Diptera: Asilidae) of Wyoming, USA with keys to genera and species, Zootaxa 4662 (1), pp. 1-126 : 40

Pogonioefferia dubius (Williston)

Erax , n. sp. ( dubius in key) Williston, 1885: 68.

Recognition characters: Grayish species; length 21 mm; mystax yellow; thorax gray pollinose, most of the dorsal setae and bristles black, laterally white; scutellum with white setae and black bristles on the margin; wings hyaline, very slightly darkened at the extreme apex; abdominal segments 1–4 with long white setae that are parted on the middle and directed outward on segments 2–4, segment 5 and remaining segments white and with very short white setae; male abdominal segments 1–2 conspicuously darker; femora black, tibiae and tarsi yellowish red to red except tips of the tibiae.

Distribution: Recorded from Wyoming by Cole (1969) (as Efferia dubia ); Geller-Grimm (2018); Hine (1919) (as Erax dubius ); Martin & Wilcox (1965) (as Efferia dubia ).

Habitat: Pine-douglas fir forest (clearings within the forest where shrubs and grasses are dominant), sagebrush steppe shrub and grassland, and grama-needlegrass-wheatgrass and grama-buffalo grass grassland vegetation types.

Ethology: Nothing known.

Prey: None known.