Five new genera of Baetidae (Insecta: Ephemeroptera) from South America

The description of new taxa of small minnow mayflies (Insecta: Ephemeroptera: Baetidae) includes the following. Crypto-nympha copiosa n. gen. and n.sp., from Brazil, is distinguished by long, robust, pilose setae on the medial margin of the prosthe-cae; apically narrow glossae and paraglossae; absence of hindwingpads; and long, basally narrow gill 1. Rivudiva n. gen., in-cluding R. minantenna n.sp., from Brazil, and R. trichobasis n.sp., from Brazil and Paraguay, is distinguished by a broad lingua and relatively narrow superlinguae; broad glossae with a distomedial row of long, robust, falcate, simple setae; and tarsal claws with minute denticles arranged in an ellipse. Spiritiops silvudus n.gen. and n. sp., from Brazil and French Guyana, is distingui-shed by a long, robust, pilose seta arising from the medial margin of the right prostheca and tarsal claws with two rows of den-ticles and lateral long, fine, simple seta. Varipes lasiobrachius n. gen. and n. sp., from Colombia and Ecuador, is distinguished by the reduced right prostheca and U-shape arrangement of denticles on the tarsal claws. Zelusia principalis n. gen. and n. sp., from Brazil and Colombia, is distinguished by a medially raised labrum, bifid right prostheca, and long, slender maxillary palps. Cinq genres nouveaux de Baetidae (Insecta: Ephemeroptera) d'Amérique du Su