Schönherr included a variety of forms under Cyphus, and the type of his Stirps I. (C. argillaceus, Germ. = gibber, Pallas) does not agree very well with the N.- and Central-American species†, which mostly belong to his Stirps II. (type Curculio 16-punctatus, L.); C. juvencus and its allies are here placed under a separate genus, and there are other southern forms that will probably have to be eliminated sooner or later. The species from our region placed under Cyphus may be known by their subquadrate, broad, sulcate rostrum; the very prominent, convex, laterally placed eyes; the comparatively short scape and the short obconic outer joints of the funiculus of the antennæ; the bisinuate, feebly margined base of the prothorax; the fusion or approximation of the outer elytral striæ from about one-third from the base; the prominent humeri; the minute or obsolete scutellum; the laminate, squamose apex of the posterior tibiæ, with the glabrous articular surface ascending; and the broad tarsi, at least in the males. The females of all of them have an oblique impressed line on each side of the fifth ventral segment in front.
† C. gibber has an irregular additional row of punctures on the alternate elytral interstices, the outer striæ free, the rostrum longer, &c.