Thereva brunnea Cole, 1923

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

Thereva brunnea Cole

( Fig. 12 )

Specimens examined (15). BC: Cathedral Provincial Park, Glacier Lake; Cathedral Provincial Park, Quinescoe Mountain summit; Hope, Nicolum River; Manning Provincial Park, Strawberry Flats; Nicola; Saanich, Mount Newton; Victoria, Ten Mile Point; Wellington. DEBU, RBCM, SEM.

Database and literature records (44+4). BC: Agassiz ; Chase ; Courtenay ; Cultus Lake Provincial Park ; Dean River ; Gabriola Island ; Gillies Bay ; Hornby Island , Norman Point ; Merritt , Midday Valley ; Mesachie Lake ; Mission ; Nanaimo ; Quadra Island ; Vancouver ; Vancouver , University of BC; Victoria (type locality); Wellington. CASC, CNCI, EMEC, INHS, MCZC, MEI, NHMW, OSUC, OSUO, SEM .

iNaturalist records (1). Tipella, Harrison Lake, north end (iNat 53228675) ( Fig. 12 ).

Conservation status. BC: S4

Distributional notes. In British Columbia, T. brunnea is widespread in coastal areas (Victoria, Vancouver, Dean River) and the southwestern Interior (Chase, Merritt). It is especially frequent on the south coast and likely occurs east to the Rocky Mountains based on records in adjacent jurisdictions ( Holston & Irwin 2005).

Ecoprovinces and other designations. BC: Coast and Mountains, Georgia Depression, Southern Interior, Southern Interior Mountains.

Range. Cordilleran. British Columbia and Alberta south to Montana and California ( Webb et al. 2013).

Biological notes. Flight period: 4 May–6 September. Thereva brunnea is found from sea beaches to alpine meadows.

Figures

FIGURES 6–13. Selected species documented in this paper. Fig. 6. Acrosathe vialis male, Central Saanich, British Columbia, 21 June 2021 (iNaturalist 84506944). Photo by Thomas Barbin. Fig. 7. Pallicephala pachyceras male, Lake Cowichan, British Columbia, 24 June 2020 (iNaturalist 51032384). Photo by Brian Starzomski. Fig. 8. Psilocephala vicina female, Nahatlatch Provincial Park, British Columbia, 25 June 2021 (iNaturalist 97392001). Photo by Lena Chiasson. Fig. 9. Spiriverpa albiceps female, Cape Scott, Vancouver Island, British Columbia, 28 June 2020 (iNaturalist 57752358). Photo by Thomas Barbin. Fig. 10. Spiriverpa albiceps male, Teslin, Yukon, 31 July 2020 (iNaturalist 55078839). Photo by Jukka Jantunen. Fig. 11. Tabuda planiceps female, Kilpoola Lake area, Osoyoos, British Columbia, 23 May 2022 (iNaturalist 122086201). Photo by Brian Starzomski. Fig. 12. Thereva brunnea female, Tipella, Harrison Lake, British Columbia, 6 July 2020 (iNaturalist 53228675). Photo by Blair Dudeck. Fig. 13. Thereva webbi female laying eggs in the soil. Whitehorse, Yukon, 12 July 2020 (iNaturalist 52909455). Photo by Jukka Jantunen.