Calosoma haydeni is a species of ground beetle in the subfamily of Carabinae. It was described by Horn in 1870. This species is found in Mexico and the southern United States.
Adults are brachypterous.A Treatise on the Western Hemisphere Caraboidea (Coleoptera)
Subspecies Calosoma haydeni haydeni (Chihuahua, Arizona, Colorado, New Mexico, Texas) - Hayden's caterpillar hunter Calosoma haydeni punctulicolle Bates, 1891 (Chihuahua, Coahuila, Distrito Federal, Durango, Neuvo Leon, San Luis Potosi; Texas) - holey-necked caterpillar hunter
References