Thereva duplicis Coquillett, 1893

Gibson, Joel F. & Cannings, Robert A., 2025, The Stiletto Flies (Diptera: Therevidae) of British Columbia, Yukon, and Alaska, Zootaxa 5618 (4), pp. 481-508 : 498-499

Thereva duplicis Coquillett

Specimens examined (0).

Database and literature records (13). BC: Fort St. John; Quesnel; Soda Creek. YT: Minto Landing. CASC, SEM.

Conservation status. BC: S3S4, YT: SU

Distributional notes. Only three localities are known in British Columbia for T. duplicis , two in the Cariboo (Quesnel, Soda Creek) and one in the Peace River region (Fort St. John). Probably the species ranges extensively in the North, based on records in the Yukon, Northwest Territories, and Alberta ( Webb et al. 2013). Thereva duplicis is mostly a species of the Great Plains but extends west into the Cordillera and east in the boreal forest as far as Ontario. There is one record in the central Yukon (Minto Landing).

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

Range. Great Plains . Yukon and Northwest Territories east to Ontario, south to Michigan, Minnesota, South Dakota, Wyoming, and Montana ( Webb et al. 2013).

Biological notes. Flight period: 25 June–29 July. Thereva duplicis mainly lives in mixed or broadleaf woodland ( Holston & Irwin 2005) but also has been recorded in boreal forest and prairie habitats.