Canadian Journal of Arthropod Identification No. 42 (December, 2020) SHERIN Soldier flies of the subfamily Pachygastrinae of Canada (Diptera, Stratiomyidae) Linley M. Sherin McGill University, Department of Natural Resource Sciences, Macdonald Campus, 21,111 Lakeshore Road, Ste-Anne-de-Bellevue, Quebec, H9X 3V9, Canada. Corresponding author:
[email protected] Abstract The Pachygastrinae are a large, globally distributed subfamily of soldier flies (Diptera, Stratiomyidae). Despite being widespread, they have poor representation in museum collections and are mostly known from larvae collected under the bark of fallen logs. All seven Canadian genera and nine of the eleven Canadian species are herein reviewed and keyed. An updated checklist to the Canadian species is presented. Twenty-one new provincial records are reported, and four species are recorded from Canada for the first time: Cosmariomyia pallidipennis (Williston), Gowdeyana punctifera (Malloch), Neopachygaster vitrea Hull and Pachygaster pulchra Loew. This increases the known fauna in Canada from seven to 11 species. Published online December 04, 2020 Introduction Adults of the Nearctic Region are small (2.0– 3.6 mm), The Stratiomyidae, or soldier flies, are a large, predominantly black flies, often with silvery vestiture cosmopolitan family (~2850 spp.) of lower brachyceran (Kraft and Cook 1961; Woodley 2001). Though sexual flies that are diverse in both size and morphology (Hauser dimorphism is prevalent in soldier flies, Pachygastrinae et al. 2017; James 1981). There are 114 species recorded often display only subtle variation between sexes (Curran from Canada. However, a recent review of Canadian 1927). Adults of many species form swarms, and the Diptera predicted an additional 5-10 species remain to be Nearctic species Gowdeyana punctifera Malloch has recorded or described (Savage et al.