Six new species and one new subspecies of Noctuidae are described from western United States of America and Baja California, Mexico: Dolocucullia poolei Crabo & Hammond, sp. n. (Cuculliinae), Plagiomimicus yakama Crabo & Wikle, sp. n., Plagiomimicus yakama mojave Wikle & Crabo, ssp. n., Plagiomimicus incomitatus Mustelin, sp. n. (Amphipyrinae), Sympistis ferrirena Crabo, sp. n. (Oncocnemidinae), Aseptis harpi Crabo & Mustelin, sp. n., and Hypotrix lactomellis Wikle & Crabo, sp. n. (Noctuinae). The adults and genitalia of these species are described, illustrated, and compared to similar related moths. The larvae of the Plagiomimicus tepperi species group, unknown previously, are reported to feed on several species of Brickellia Ell. (Asteraceae). The early stages of Plagiomimicus yakama mojave are described and late instars are illustrated.