Blethisa julii is documented from Canada in the provinces of Alberta, Manitoba, New Brunswick, Newfoundland, Nova Scotia, Ontario, Québec, and Saskatchewan, and in the USA from Maine, New Hampshire, New York, and Vermont (Lindroth 1961; Goulet and Smetana 1983; Bousquet 2012; www.gbif.org/species/4988208) (Fig. 2a). The earlier records from Ontario are in eastern Ontario and in Québec along the border with Ontario. Our new records extend its range in Ontario north by 500 km. These were not unexpected. Blethisa julii was collected from Churchill, Manitoba (Lindroth 1961), demonstrating that it can occur at northern latitudes. Lindroth (1961) noted that this species generally inhabits areas on the edges of ponds. The record from Akimiski Island represents the first record of B. julii in Nunavut.