The genus Labiobaetis recently has been reported from Madagascar by Lugo-Ortiz and McCafferty (1997). The two describedspecies were only known from the nymphal stage. Examination of material from more than 800 samples in Madagascarallows descriptions of six new species: Labiobaetis longicercus, L. dambrensis, L. nigrocercus, L. vulgaris, L. punctatus and L.gilliesi. They can be distinguished easily by the shape of the second segment of the labial palp, the shape of the second segmentof the maxillary palp, the setation of the labrum, the number of gills, the presence or absence of hindwings and coloration of theabdomen. At present, the imagoes of only five of the eight species are known. They can be identified by the presence or absenceof hindwings, coloration of the wings, shape of the sclerotized process between gonopods and shape of the third segment ofthe gonopods.As all the species assigned to Labiobaetis were recently reassigned to Pseudocloeon, the status and validity of the generaLabiobaetis and Pseudocloeon are discussed.
