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Six new genera are erected as follows: in the Issini, Argepara gen. n. (type species: Hysteropterum semipellucidum Melichar, 1906), Aztecus gen. n. (type species: Hysteropterum montezuma Kirkaldy, 1913), Incasa gen. n. (type species: Hysteropterum riobambae Schmidt, 1910), Bumaya gen. n. (type species: Bumaya knorozovi sp. n.); and in the Colpopterini, Caudibeccus, gen. n. (type species: Colpoptera carlota Myers, 1928) and Jamaha gen. n. (type species: Poeciloptera elevans Walker, 1858). Four new generic synomymies are proposed: Prothona Caldwell, 1945 and Plummerana Caldwell, 1945 are placed in synonymy under Proteinissus Fowler, 1904. Thionissa Metcalf, 1938 is placed in synonymy under Dracela Signoret, 1861. Hesperophara Kirkaldy, 1904 is placed in synonymy under Colpoptera Burmeister, 1835.
Three new genera of the family Issidae are described for species formerly included in the genus Hysteropterum sensu lato: Balduza Gnezdilov and O’Brien, gen. n. (type species: Hysteropterum unum Ball 1910), Stilbometopius Gnezdilov and O’Brien, gen. n. (type species: Issus auroreus Uhler 1876), Abolloptera Gnezdilov and O’Brien, gen. n. (type species: Hysteropterum bistriatum Caldwell 1945),. The genus Tylanira Ball 1936 is redescribed. The male genitalia of Tylanira bifurca Ball 1936 is described and illustrated. Tylana ustulata Uhler 1876 is transfered to Tylanira. Hysteropterum bufo Van Duzee 1923 is transfered to Balduza gen. n. and the male genitalia of the species is described and illustrated. The subgenus Paralixes Caldwell 1945 of the genus Ulixes Stål 1861 is raised to genus – Paralixes Caldwell 1945, stat. n. A key to the issid genera of the United States is given. New data on the distribution of 7 species are given.
