This species of sawfly is "known from southern Alberta and BC southward. It is found in the subalpine zone usually on herbaceous
Potentilla (Goulet pers. com. 2012).
Goulet (1998) provides the following description of the genus Tenthredo: "The biology of Tenthredo species is unusual for sawflies. Based mostly on European host data, larvae feed over an extremely wide range of plants, from ferns to Asteraceae and Fabaceae. Generally, most species are recorded from one host species. The most common types of host plants are herbaceous. Moreover, adults are exceptional among sawflies as they are predators and usually pollinators (Goulet, 1996a). The predatory behaviour is marked and similar to that of tiger beetles. Adults of many species actively pollinate many plant species and feed on nectar. Adults of oviposit generally later than most tenthredinid sawflies in June to late August. Finally, adults are large and remarkably showy Hymenoptera, and thus, have been regularly collected by entomologists."
