The following communication includes two genera of Chalcidiae,Perilampus, and Callimome. Perilampus is known in America from Canada to Mexico. P. hyalinus Say, inhabits Canada; P. cyaneus Brulle and P. Entellus Walk. are synonyms of it. Say has described two other species, P. platigaster and P. triangularis; the latter is distinguished from all other species by the dark tips of the wings. P. Alexinus Walk differs from P. platigaster by not having a brassy tinge, by the luteous tips of the femora, and by the luteous tibiae with a black band.