Hi, Bugman. I love your site, although I’m glad I don’t have any of those bugs at my place! The one I found is bad enough. I found it in my front yard in suburban Chicago. Can you ID it?
You have photographed a dead Caterpillar Hunter, Calosoma scrutator, one of the Ground Beetles from the family Carabidae. They are predaceous, feeding on insects and other small animals. They are especially fond of caterpillars. They help to control Gypsy Moths and Tent Caterpillars. Adults will climb trees and they can also fly, often being attracted to lights in the spring. They are beneficial and should not be killed.