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Th e white gypsum dune ecosystem in the Tularosa Basin in south central New Mexico is the largest gypsum dune fi eld on earth, covering 712.25 km 2 . White Sands National Monument in Otero County, New Mexico, protects approximately 40 %, 297.85 km 2 , of this dune fi eld. In 2006 the US National Park Service initiated a long term study of the Lepidoptera at White Sands National Monument, resulting in the discovery of two new species, Euxoa lafontainei Metzler & Forbes, sp. n. and Protogygia whitesandsensis Metzler & Forbes, sp. n. described herein. Adult moths and male and female genitalia are illustrated for Euxoa lafontainei, and adults and male genitalia are illustrated for Protogygia whitesandsensis and its relatives.

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The species of the genus Ogdoconta Butler, 1891 (Lepidoptera, Noctuidae, Condicinae, Condicini) from North America north of Mexico are reviewed, and a description of the genus is given. Ogdoconta satana Metzler, Knudson & Poole, sp. n., is described from New Mexico and Texas, Ogdoconta rufipenna Metzler, Knudson & Poole, sp. n., is described from Arizona, and Ogdoconta fergusoni Metzler & Lafontaine, sp. n., is described from Florida, Mississippi, and Louisiana. A key to the species of Ogdoconta of North America north of Mexico is provided. Adult moths and male and female genitalia of Ogdoconta satana, Ogdoconta rufipenna, Ogdoconta fergusoni, Ogdoconta cinereola (Guenée, 1852), Ogdoconta moreno Barnes, 1907, Ogdoconta sexta Barnes & McDunnough, 1913, Ogdoconta altura Barnes, 1904, and Ogdoconta tacna (Barnes, 1904) are illustrated.