[Kirby divides the genus calosoma into two sub genera: Calosoma proper having the maxillary palpi with the last joint of the length of the last but one, and the elytra gilded; Chrysostigma having the maxillary palpi with the last joint shorter than the last but one, and the elytra obscure with gilded puuctiform impressions. The two species that he describes both belong to the latter sub-genus. Dr. Le Conte (Pro. Acad. Nat. Sci. Phil.,, Feb. 1862, p.52) has given a more complete classification of the species of this genus into six groups, based upcin the differences of the anterior tarsi of the males. Kirby's division has not been adopted by subsequent authors.]