Thereva albopilosa Kröber, 1912

Thereva albopilosa Kröber View in CoL

Specimens examined (16). BC: Atlin, Ashcroft, Three Sisters Creek; Bennett Lake; Bridge Lake, Scot Lake FSR; Clinton, Riley Dam FSR; Fort St. John; Oliver, Mount Baldy. YT: Kluane National Park, Kaskawulsh River; Spirit Lake, fen to south; Sulphur Lake; Whitehorse, W of Copper Ridge; Whitehorse, 5 km N; Whitehorse, Riverdale. RBCM, ROME.

Database and literature records (6). BC: Burns Lake; Keremeos, Twin Lakes; Lillooet; Osoyoos, Mount Baldy Summit Road. YT: Whitehorse. CNCI, SEM.

Conservation status. BC: S3S4, YT: S4

Distributional notes. Thereva albopilosa ranges east of the Coast Mountains in British Columbia: Okanagan Valley (Twin Lakes, Oliver), north to Lillooet on the Fraser River, Burns Lake on the central plateau, Peace River region (Fort St. John), and Bennett Lake near the Yukon border. As the species occurs in the Yukon and the Alberta Rockies, it certainly ranges throughout the valleys, plateaus and mountains of most of British Columbia east of the Coast Mountains. In the Yukon, known locations are in the southwest (Kluane, Whitehorse, Sulphur Lake).

Ecoprovinces and other designations. BC: Southern Interior, Central Interior, Northern Boreal Mountains, Boreal Plains. YT: Boreal Cordillera.

Range. Cordilleran. Southern Yukon south through British Columbia and Alberta to Nevada and New Mexico ( Webb et al. 2013).

Biological notes. Flight period: 15 June–29 July. Thereva albopilosa has been collected in a small grassland adjacent to Pinus contorta woods, on sand dunes with sparse Pinus contorta and moss/lichen crust/ Arctostaphylos uva-ursi ground cover, in a rich marl fen, and on a roadside rock outcrop. Forest and steppe habitats are the norm ( Holston & Irwin 2005).