Holopogon seniculus Loew

Holopogon seniculus Loew, 1866: 36 .

Recognition characters: Grayish species; length 5–7 mm; mystax yellowish white; thorax gray pollinose covered with long white setae dorsally; wings hyaline with yellowish veins both macrotrichia and microtrichia white; abdomen shining black, lateral setae on abdominal segment 1 white; legs black with white setae and bristles.

Distribution: CONVERSE: Dave Johnson Plant/Station 5 and 6, Glenrock, 23 June–19 August 1973 (SD, RJL). GOSHEN: Jay Em, 22 June 1955 (WAD). LARAMIE: Pine Bluffs, 13 July 1969. NIOBRARA: Lusk, 14 July 1937 (HTP-UK); 9 Aug. 1950 (DGD); Manville, 16 July 1947 (DGD). PLATTE: Camp Guernsey, WANG, 2001b (CSU, GMAD); Cherry Creek, SE of Wheatland, 30 June 1966 (RJL); Dwyer, 5 July 1961 (RJL); 20 July1962; Guernsey, 14 June–20 July 1962, 25 June 1963 (RJL); Hartville, 9 July 1964 (RJL); Platte Co., 4 July 1945 (REP). SHERIDAN: Sheridan, WANG, LTA, 14–15 June 2007 (CSU, GMAD). SWEETWATER: Farson, Big Sandy, Aug. 1931 (VMT-BYU). Recorded from Wyoming by: Adisoemarto (1967); Back (1909) [Lorrey’s Lake (Sept. 7) and Carbon County (AMNH)]; Cole (1969); Dennis et al. (1986) [as prey of Carinefferia cressoni (as Efferia cressoni)], (2010); Geller-Grimm (2018); Lavigne et al. (1993); Martin (1959) [Lusk, Aug. 26, 1895 (W. M. Wheeler)].

Habitat: Sagebrush steppe shrub and grassland, and grama-needlegrass-wheatgrass grassland vegetation types. Open rangeland; especially in wind sheltered gullies (see Lavigne et al. 1993).

Ethology: Forages from tips of bare branches of the shrubs three-leaf sumac ( Rhus trilobata Nutt.) and alderleaf mountain mahogany ( Cercocarpus montanus Raf.); courtship (see Lavigne et al. 1993).

Prey: DIPTERA, Cecidomyiidae; Lestrimiinae; Scenopinidae: unidentified; Syrphidae: Paragus tibialis (Fallen), Guernsey, 25 June 1963. DIPTERA, HEMIPTERA (Heteroptera, Homoptera), HYMENOPTERA, PSOCOP- TERA, THYSANOPTERA (see Dennis et al. 2010; Lavigne et al. 1993).