Thereva aurofasciata Krober 1912

Thereva aurofasciata Kröber Thereva nigripilosa Cole, described from Victoria, British Columbia, is a synonym (Holston & Irwin 2013). Specimens examined (33). BC: Alexandria; Arrow Lakes, Burton; Hope, Hunter Creek; Kamloops; Kamloops, Mount Lolo; Kilpoola Lake; Lac du Bois; Okanagan Falls, White Lake; Osoyoos; Osoyoos, Mt. Kobau (Fig. 17); Penticton, West Bench; Robson; Saanich, Rithet’s Bog; Spaist Mountain, Pimainus Lakes; Vernon, Becker Lake; Vernon, Cosen’s Bay. RBCM. Database and literature records (33). BC: Aspen Grove; Christina Lake; Cranbrook; Fernie, Kamloops, Lac la Hache; Manning Park, Blackwall Peak; Oliver; Pass Creek; Robson; Trinity Valley; Victoria; Victoria, Gordon Head. YT: Snafu Creek, Whitehorse. CASC, CNCI, MEI, OSUC, SEM. Conservation status. BC: S4, YT: SU Distributional notes. Thereva aurofasciata is relatively common across southern British Columbia, from Vancouver Island (Victoria) east to the Okanagan (Oliver, Vernon) and the East Kootenay (Cranbrook, Fernie), north to the Thompson Valley (Kamloops) and Cariboo (Lac la Hache). The species is probably more widespread in northern areas of the province because it is recorded from the southern Yukon (Whitehorse, Snafu Creek). Ecoprovinces and other designations. BC: Georgia Depression, Southern Interior, Southern Interior Mountains, Central Interior. YT: Boreal Cordillera. Range. Cordilleran. Yukon south through British Columbia and Alberta to California, Arizona, and New Mexico (Webb et al. 2013). Biological notes. Flight period:15 May–18August.The species has been collected in Artemisia / Pseudoroegneria grassland; open Pinus ponderosa / Pseudotsuga menziesii / Populus tremuloides woodland; an aspen draw in Pinus ponderosa woodland; and a fen with grasses, sedges, Salix, and Spiraea. Sites range from lowland habitats to subalpine meadows (Fig. 17). Holston & Irwin (2005) give typical locations as “forest and steppe habitats”.