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Three new species of the orthotyline genus Parthenicus Reuter are described and the seven previously known species of eastern North America are diagnosed. Parthenicus cruentus, n.sp. is described from Nebraska, P. sedumicola, n.sp. from Arkansas, and P. wheeleri, n.sp. from Oklahoma and Texas. A lectotype from Texas is designated and male genitalia are illustrated for P. psalliodes Reuter, the type species of the genus. Also provided are selected scanning electron photomicrographs and illustrations of the male genitalia for new species, a color habitus illustration for P. sedumicola, and for all species a color dorsal habitus photograph, hosts, and distribution information. A revised identification key to the 10 eastern species is given to help distinguish species.