In the Canadian Entomologist for May (page 140) there appears an article by Mr. Wm. H. Patton, entitled “Zethus Aztecus in Florida,” in which the author attempts to prove that Zethus Poeyi, Slossan♂ and aztecus are the same species. As I am the authority for one of these species, it was but natural that I should make a study of the trio, in order to ascertain if Mr. Patton's assertions were correct.