''Calosoma frigidum'', also known as the cold-country caterpillar hunter, is a species of

ground beetle Ground beetles are a large, cosmopolitan family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North America and 2,700 in Europe. As of 2015, it is one of the 10 most species-rich animal f ...

in the subfamily

Carabinae Carabinae is a subfamily of beetles in the family Carabidae, containing the following genera: * '' Aplothorax'' Waterhouse, 1841 * ''Calosoma'' Weber, 1801 *'' Calosoma oregonus'' Gidaspow, 1959 * ''Carabus'' Linnaeus, 1758 * '' Ceroglossus'' So ...

. It was first described by William Kirby in 1837. Occurring throughout southern Canada and the United States, it is about 16mm to 27mm long and black, with rows of pits or dots along its elytra. These pits are an iridescent blue/green, and larger than the pits of many other ''Calosoma'' species. It can be found in wooded areas and is active at night, while hiding under debris by day.

References

frigidum Beetles described in 1837 {{Calosoma-stub