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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]