Pogonioefferia dubius (Williston, 1885) Original Description: Erax dubiu s Williston, 1885. Published State Records: Cole (1969) (Wyoming; as Efferia dubia); Geller-Grimm (2016) (Wyoming); Hine (1919) (as Erax dubius); Martin & Wilcox (1965) (Wyoming; as Efferia dubia). Published County Records: None known. Museum Records: None known. Pogonioefferia frewingi (Wilcox, 1966) Original Description: Efferia frewingi Wilcox, 1966. Published State Records: Dennis & Lavigne (1976b) (pupal case; as Efferia frewingi), (2007) (as Efferia frewingi); Dennis et al. (1975) (prey recognition; as Efferia frewingi), (2009, 2010) (as Efferia frewingi); Geller-Grimm (2016) (Wyoming); Lavigne (1972) (as Efferia frewingi), (1992) (as Efferia frewingi); Lavigne & Dennis (1994) (as Efferia frewingi); Lavigne et al. (1980) (as Efferia frewingi). Published County Records: AL [Dennis et al. (2008) (pupal case; as Eff eria frewingi)]; CB [Dennis & Lavigne (1975) (as Efferia frewingi; as prey of Scleropogon neglectus)]; FR [Lavigne & Dennis (1975) (ethology; as Efferia frewingi)]; PL. Museum Records: AL (pupal case deposited in United States National Museum of Natural History); BH; CB; FR; HS; LI; PA; PL; TE.

Published as part of Lavigne, Robert J. & Dennis, D. Steve, 2017, A checklist of the Robber Flies (Insecta: Diptera: Asilidae) of Wyoming, USA, pp. 335-365 in Zootaxa 4238 (3) on page 339, DOI: 10.11646/zootaxa.4238.3.2, http://zenodo.org/record/345779