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Background: The genus Illiesonemoura Baumann, 1975 (Plecoptera, Nemouridae) is a small-sized stonefly with slender and curved embranous cerci. Currently, 18 species of the genus are known worldwide, mainly distributed in the Palaearctic and Oriental Regions, with a total of two species known to China. New information: Three new species of Illiesonemoura Baumann, 1975, I. bituberculata Wang & Du, sp. nov., I. motuoensis Du & Ji, sp. nov. and I. weii Du & Ji, sp. nov. are described and illustrated, based on male adults from China. Illiesonemoura bituberculata is characterised by two pairs of tubercles arising posteromedially from tergum 10 and by two rows of spinules outlining the lateral edge of the ventral sclerite of the epiproct. Illiesonemoura motuoensis is characterised by the heart-shaped epiproct with a thin and slightly sclerotised protrusion between the sclerotised bands. Illiesonemoura weii is characterised by a pair of small knobs on tergum 10, outer lobes of paraprocts basally broad, then slender towards apices with a pointed tip and the epiproct with lateral spinules. [ABSTRACT FROM AUTHOR]

Three new Chinese species of the genus Mesonemoura (Plecoptera: Nemouridae), Mesonemoura dilatata Du & Ji, sp. nov., M. sichuanensis Du & Ji, sp. nov. and M. sinistracurva Du & Wang, sp. nov., are described and illustrated. Mesonemoura dilatata is characterized by the flagellum of the epiproct being long and curved, forming a swollen membranous apex. Mesonemoura sichuanensis is characterized by tergum 9 forming a pair of obtuse angles mid-posteriorly, and by the ventral sclerite of the epiproct being basally broad, 2 x the width of the dorsal sclerite. Mesonemoura sinistracurva is characterized by the presence of a long stylus that curves abruptly to the left as it leaves the tip of the epiproct. A key to the Chinese species of this genus is presented. [ABSTRACT FROM AUTHOR]

Four new species of the genus Amphinemura (Plecoptera: Nemouridae) were described from Sichuan, China with morphological descriptions and illustrations, i.e., A. gyracantha Ji & Du sp. nov., A. digitata Ji & Du sp. nov., A. spinellosa Du & Ji sp. nov., and A. qingchengshana Ji & Du sp. nov. A. gyracantha is similar to Amphinemura dispositspina Du & Wang, 2007 in the epiproct, but the morphology of the lateral arm of the epiproct and the median paraproct lobe of the new species is diagnostic. A. digitata is related to A. sclerotica Du and Zhou, 2007 in having a similar paraproct in the ventral view, but the epiproct of two new species is distinct. A. spinellosa is similar to A. lii Zhu and Yang, 2003 in the paraproct, but A. denticulat can be easily separated by inner lobe slightly sclerotized and outer lobe separated from median lobe. A. qingchengshana is related to A. claassenia Wu, 1935 in having a similar epiproct, but they differ mostly in the details of paraproct. [ABSTRACT FROM AUTHOR]