I have received from the author a copy of this pamphlet in which a large number of North American species and genera are somewhat briefly described in anticiption of the publication of a general Monograph. That M.Ragonot is in a situation to materially increase our genral knowledge of the group cannot be doubted. He has long collected types and specimens, and has studied the characters of the Old World genera. I have deprecated the description of Phycidæ without giving the full structural characters, and in so far as this has been do I agree with M. Ragonot's introductory remarks.