A Revision of the Genus Helopicus (Plecoptera:Perlodidae)

The genus Helopicus is revised and three species are recognized. The male, female, nymph and egg of H. bogaloosa, a new species from the southeastern U.S., is described and a male holotype and female allotype are designated. Redescriptions of H. subvarians (Banks) and H. nalatus (Frison) are presented and adults and nymphs are keyed. Nymphs of the three species display distinctive pigmentation patterns and also have subtle differences in mouthparts. Males and females are separated on the basis of genitalic morphology and pigmentation patterns. Descriptions are supported by drawings and SEM micrographs.