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Show 1 9 0 4 .J AMERICAN PHYTOPHAGOUS COLEOPTERA. 4 0 9 to tlie apex, a stripe, widened medially, near the lateral margins and likewise abbreviated posteriorly, black, this stripe connected at its apex with an elongate spot, forming a hook, another small black spot is placed near the scutellum ; under side and legs testaceous. Hah. Prov. Tucuman, Argentine Rep. (C. Bruch). Of different elytral marking than any other species of the genus described. In the collection of the La Plata Museum and my own. S yst en a a n t e n n a t a , sp. 11. Flavous, the apical joints of the antennae black ; thorax impunctate ; elytra fulvous, extremely minutely punctured. Mas. Antennae robust, the basal joint strongly thickened, deeply concave above. Fern. Antenna* of normal shape. Length 5 millim. Mas. Head impunctate, with a short central groove, the frontal elevations flat and broad, carina linear; antennae stout, the lower six joints flavous, the others black, basal joint short and very thick, deeply hollowed out at the apex, the latter produced into a point, second joint short, third one-half longer, the following joints more elongate; thorax nearly twice as broad as long, the sides rounded, the disc very obsoletely transversely sulcate near the base ; elytra wider at the base than the thorax, reddish-fulvous, extremely minutely punctured, their epipleurae broad and distinct to the apex; under side and legs flavous, posterior femora rather strongly incrassate, their tibiae with a short spine ; metatarsus as long as the following joints together, claws appendiculate ; prosternuin very narrow, the cotyloid cavities closed. Hah. Amazons. The structure of the antennae in the male differs from that of any other species known to me ; in the female, however, the basal joint is long and slender and the following two joints are both short and equal and of flavous colour only, all the others being-black : no other differences of importance are present. PsEUDOGOXA DISCOID ALLS, Sp. 11. Fulvous; the antenna?, the apex of the posterior tibiae, and the tarsi black ; thorax impunctate ; elytra parallel, impunctate, black, a sutural band, transversely widened before the middle and near the apex, flavous. Length 4 millim. Head impunctate, fulvous, with a deep fovea between the eyes, base of the clypeus very broad between the antennae; eyes large and round ; labrum and palpi piceous, the latter slender ; antennae filiform, black, the basal joint more or less fulvous, fourth and following joints slightly triangularly widened, not longer than the third joint which is more slender, terminal joint extending to the middle of the elytra; thorax about one-half broader than long, the lateral margins slightly rounded at the middle and constricted at the base, the anterior angles obtuse; the disc transversely |