is a genus of large ground beetles
that occur primarily throughout the Northern Hemisphere, and are referred to as Caterpillar hunters
. Many of the ~50 species are largely or entirely black, but some have bright metallic coloration. They produce a foul-smelling spray from glands
near the tip of the abdomen.
In 1905, Calosoma sycophanta was imported to New England for control of the Gypsy Moth. The species is a voracious consumer of caterpillars during both its larval stage and as an adult, as are other species in the genus. For this reason, they are generally considered beneficial insects.