Fiery searcher

Description

Calosoma scrutator, also known as the fiery searcher and caterpillar hunter, is a species of ground beetle belonging to the genus Calosoma, subgenus Acalosoma. This beetle can be as large as 35 millimetres (1.4 in) long. The distribution of this species is relatively widespread, but it is nonetheless uncommon in North America. The adult beetle is known to excrete a foul-smelling oil when it is handled. The oil has been described as smelling similar to rotten milk or rancid olive oil. Calosoma is a genus of large ground beetles that occur primarily throughout the Northern Hemisphere, and are referred to as caterpillar hunters or caterpillar searchers. Many of the 167 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. They are recognizable due to their large thorax, which is almost the size of their abdomen and much wider than their head.