Se describen seis nuevas especies en el género Natada, las cuales habían estado escondidas bajo el nombre Natada fusca Druce, que se definen principalmente por los genitales. La nuevas especies incluyen N. burnsi, N. truncata, N. singulara, N. chaconi, N. covelli, y N. confusa. Cinco de ocho especies en el complejo Natada fusca, que también incluye a N. fuscodivisa Dognin, están presentes en Costa Rica. La distribución del complejo tiene un ámbito desde México hasta el escudo del Amazonas y de las Guayanas. Se proporciona información geográfica detallada y múltiples dibujos de los genitales masculinos de la especie N. confusa, para ayudar a separar las especies. Se designaron el lectotipo y el paralectotipo de N. fusca.

Six new species in the genus Natada, which have been hidden under Natada fusca Druce, are described and defined primarily by genitalia. New species include N. burnsi, N. truncata, N. singulara, N. chaconi, N. covelli, and N. confusa. Five of eight species in the Natada fusca complex, which also includes N. fuscodivisa Dognin, occur in Costa Rica. Distribution of the complex ranges from Mexico to the upper Amazon Basin and Guianas. Detailed geographic information and multiple genitalic drawings of males of one species, N. confusa, are provided to help define and separate species. The lectotype and paralectotype of N. fusca are designated.

Se describe las siguientes especies nuevas del complejo Natada del Nuevo Mundo: Natada minuscula, Natada cecilia, Natada lalogamezi, Natada kokii, Natada monteverdensis, Narosopsis iangauldi, and Euprosterna wemilleri. Natada minuscula es la especie más pequeña del complejo.

The following new species in the New World Natada complex are described: Natada minuscula, Natada cecilia, Natada lalogamezi, Natada kokii, Natada monteverdensis, Narosopsis iangauldi, and Euprosterna wemilleri. Natada minuscula is the smallest known species in the complex. Of the new species, only Natada kokii, Natada cecilia and Narosopsis iangauldi are known to occur outside of Costa Rica. Previously the New World Natada complex had 43 species in the neotropics. It is anticipated that the proportion of new species in the complex will exceed other major lineages of Limacodidae found in Costa Rica.

Six generic and 65 specific names are synonymized, 26 species are transferred to other genera, 30 removed from synonymy or from subspecific status. Blazia Schaus is transferred from Lymantriidae to Limacodidae, Laruma Walker and Renada Walker from Limacodidae to Lasiocampidae and Arctiidae, respectively. Renada is a junior synonym of Paracles Walker. Several previously unrecognized Brazilian taxa described by Walker, for which types are lost, have been identified.