Thereva foxi Cole, 1923

Thereva foxi Cole View in CoL

Specimens examined (29). BC: Brandywine Mountain; Cupola Mountain; Dogtooth Range; Duffey Lake; Fort St. John; Kokanee Glacier Provincial Park; Pavilion Mountain; Secret Peak; Shelagyote Peak; Statimcets Peak; Strathcona Provincial Park, Mount George V; Tatshenshini Lake; Tweedsmuir Provincial Park, Wilson Lake; 100 Mile House, Cougar Lake FSR; Yoho National Park, Paget Peak. YT: Whitehorse, Crestview; Nares Mountain ( Fig. 19 View FIGURES 14–19 ). DEBU, RBCM.

Database and literature records (31). BC: Bear Lake, London Hill Mine; Cathedral Provincial Park, Glacier Lake Trail; Cathedral Provincial Park, Quiniscoe Mountain summit; Hedley; Moosehorn Lake; Mount Begbie; Robson; Summit Lake, mile 392 Alaska Highway; Tunjony Lake. YT: Carcross; Dempster Highway, km 155; Nahanni Range Road. CNCI, MEC, SEM, USNM.

Conservation status. BC: S5, YT: S3S5

Distributional notes. Thereva foxi is fairly common in the highlands of the southern interior (Mount Begbie; Cathedral Provincial Park), north through the central plateaus and mountains (100 Mile House; Tweedsmuir Provincial Park; Shelagyote Peak) and the Peace River region (Fort St. John) to the far north (Atlin, Summit Lake, Tatshenshini Lake). In the Yukon, the species is recorded from Carcross and Nahanni Range Road in the south to km 155, Dempster Highway, in the north.

Ecoprovinces and other designations. BC: Coast and Mountains, Southern Interior, Southern Interior Mountains, Central Interior, Sub-boreal Interior, Boreal Plains, Northern Boreal Mountains. YT: Boreal Cordillera, Taiga Cordillera.

Range. Cordilleran. Northern Yukon south through British Columbia and the Alberta Rocky Mountains to Oregon, Utah, and Colorado. ( Webb et al. 2013).

Biological notes. Flight period: 22 June–29 August. Thereva foxi is mostly found in mountain habitats such as subalpine meadows and alpine tundra. At Tatshenshini Lake, T. foxi was collected in a lush, wet, herbaceous meadow between alder thickets (RBCM). The species also inhabits dry grassland slopes ( Fig. 19 View FIGURES 14–19 ) and sand dunes ( Fig. 15 View FIGURES 14–19 ).