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The mature larva of a new species, Neoephemera projecta sp. n.,from China is described in detail. It represents a new country record of thegenus for China. The discovery shows that the genus Neoephemera McDunnoughhas a more extensive Holarctic distribution than previously known. Ecologicalvicariance instead of geographic isolation is therefore favoured as presumedcause of the origin of the three neoephemerid genera. [ABSTRACT FROM AUTHOR]

A new species, Rhithrogena trispina sp. n. from Tian-Mu-Shan Mountainof Southeast China, is described and figured in detail at the imaginal stage.From the position of gonopore on the penis lobe, it belongs to the znojkoi -group. [ABSTRACT FROM AUTHOR]

The genus Epeorus Eaton, 1881 is diverse in China but has never been specifically studied before. In this revision, eight species in Epeorus (Proepeorus) from China are recognised, including two new species, Epeorus (Proepeorus) gibbussp. nov., Epeorus (Proepeorus) falcatussp. nov. and additional five new records for this country. Both new species have unique shape of imaginal penis and tubercles on nymphal terga. The variation of Epeorus (Proepeorus) in China shows this subgenus may not be a monophyletic taxon. [ABSTRACT FROM AUTHOR]