Adenostomocoris, new genus, is described to accommodate Maurodactylus semiustus Van Duzee and Adenostomocoris pintoi, new species, both occurring only on Adenostoma spp. (Rosaceae) in southern California and adjacent Mexico. Arctostaphylocoris, new genus, is described to accommodate Chlamydatus manzanitae Knight and Arctostaphylocoris arizonensis, new species, both of which breed on Arctostaphylos spp. (Ericaceae) in the far western United States. Aurantiocoris, new genus, is described to accommodate Sthenarus cuneotinctus Van Duzee and Aurantiocoris purshiae, new species, recorded from Arctostaphylos spp. (Ericaceae) and Purshia sp. (Rosaceae), respectively, from far western North America. Gonoporomiris hispaniolae, new species, is described from the Dominican Republic. Guentherocoris, new genus, is described to accommodate Psallus atribibialis Knight, which breeds on Acacia spp. (Fabaceae) in the southwestern United States and adjacent Mexico. Megalopsallus ellae, new species, is described as occurring on Ephedra sp. (Ephedrales: Ephedraceae) in the Imperial Valley of southern California. Oligotylus ribes Schuh, 2000, is treated as a junior synonym of Oligotylus pluto (Van Duzee, 1917), new combination. Pruneocoris stonedahli, new genus and new species, is described as occurring on Prunus spp. (Rosaceae) in California and Nevada. Vanduzeephylus, new genus, is described to accommodate Reuteroscopus falcatus Van Duzee, known to breed on a variety of deciduous trees in western North America.