Abstract
We give new geographical and morphological data for the Pannota mayflies of Venezuelan Guayanan uplands. Corypho-rus aquilus (Coryphoridae), Amanahyphes saguassu and Tricorythopsis yucupe (Leptohyphidae) are newly recorded for Venezuela, the adults ofthe last species are described for the first time. Macunahyphes pemonensis sp. nov. and Macuna-hyphes incognitus sp. nov. (Leptohyphidae) are described from adults from Venezuela and Brazil, respectively. Both new species of Macunahyphes are very nearlyrelated, and are characterized among other features, by the absence of forceps, and the great development of large paired projections on the styliger plate. Caenis teipunensis sp. nov. (Caenidae) is also described from adults, its diagnostic charactersinclude: forceps apically sharp and sclerotized, and very large apophyses of the styliger sclerite. We give fiew locality records for Tricorythopsis volsellus, previously known from other localities in Venezuela.
NSTL