Boreidae Stephens 1829
Only two of the 15 North American Boreus species occur in Ontario, and they are easily distinguished from one another on the basis of color as illustrated here. Adults emerge late in the year, and are active on mild winter days when they are often seen on or near the moss in which they develop. As the common name “snow scorpionflies” suggests, they are often seen on the snow surface.Boreids are easily identified by their minute size, rudimentary wings, and females with an ovipositor.
Boreus nivoriundus Fitch 1847
Body color light brown. Apex of ninth sternum rounded or truncate.
Within Canada, B. nivoriundus is known from southern Ontario and Quebec. It is less frequently collected than B. brumalis.