Caterpillar Hunter (Calosoma scrutator)
Calosoma is a genus of large ground beetles that occur primarily throughout the Northern Hemisphere, and are referred to as Caterpillar Hunters or Searchers. Many of the aproximately 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.
The Caterpillar Hunter (Calosoma scrutator) is a brilliant, metallic green beetle. The wing covers have many fine longitudinal furrows that are beset with tiny punctures, and each cover has a reddish-copper border. The head, pronotum, and legs are deep metallic blue or purple, and the pronotum has a gold margin. Imprudent handlers could receive an unwelcome nip from the hefty mandibles. However, Calosoma scrutator is a highly beneficial species that climbs trees in search of caterpillar prey. Although the beetles are active from May to November, they seem to be especially numerous in May after trees are fully leaved out and while the spring flush of caterpillars is ravaging the foliage. Adults winter over, and they live up to 3 years. Eggs are placed one at a time in soil. Larvae also hunt caterpillars and climb trees and shrubs in search of prey. They pupate in earthen cells.
More info: [link]
Featured by the talented Luca
in her journal "The hunter and the prey": [link]