A new genus and five new species of Central and South American Hemileucinae (Lepidoptera: Saturniidae).

All the following new taxa have in common that they are inhabitants of the cordilleras in Central and South America, at elevations from 2000-4600m. Arias n. gen ., A. inbio n. sp ., is a day flier, while 4 other new species are nocturnal. Three of these belong to the genus Meroleuca and one to the genus Periphoba. Adults of the five species are illustrated in color; their genitalia are figured, their known range is indicated, and their phylogenetic relationships are discussed. Les taxa decrits ci-dessous ont pour caractere commun d'habiter les cordilleres centro et sud-americaines a des altitudes comprises entre 2000-4600m. Arias n. gen ., inbio n. sp ., est diurne, les quatre autres especes sont nocturnes, trois de celles-ci appartiennent au genre Meroleuca, la quatrieme est un Periphoba. Les adultes sont illustres en couleur, les armures genitales figurees, la repartition geographique est indiquee et la position taxonomique precisee.