About Calosoma frigidum Kirby, 1837
Calosoma frigidum, commonly called the cold-country caterpillar hunter, is a species of ground beetle belonging to the subfamily Carabinae. This species was first formally described by William Kirby in 1837. It occurs across southern Canada and the entire United States. Adults measure between 16 millimeters and 27 millimeters in length, and have a solid black body. Rows of pits or dots run along the species' hardened wing covers, called elytra. These pits have an iridescent blue-green color, and are larger than the comparable pits found on many other species in the Calosoma genus. This beetle lives in wooded habitats; it is active during the night, and hides under debris during the day. Raised soil temperatures, like those that occur after a forest fire, are known to trigger adult C. frigidum to exit their underground burrows.
