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The only known member of genus Leuctra Stephens, 1836 from China, L. fusca tergostyla Wu, 1973 is discovered in Sichuan Province of southwestern China for the first time. New illustrations of this subspecies are provided for identification. The taxonomic status of L. f. tergostyla is discussed. Another species of Leuctridae, Rhopalopsole sinensis Yang & Yang, 1993 is studied herein and supplemented with new illustrations. The female of R. sinensis is illustrated for the first time.

Two new species of Korean needleflies, Perlomyia koreana sp. n. and P. lamellata sp. n. are described from North and South Korea. Additionally, two species, Paraleuctra paramalaisei sp. n. and Perlomyia baei sp. n. are described from South Korea. The previously unknown male of Perlomyia martynovi (Zhiltzova, 1975) is described from South Korean specimens associated with females. Leuctra fusca tergostyla Wu, 1973 comb. n. is proposed for the Far Eastern populations of the Eurosiberian L. fusca (Linnaeus, 1758). Three Leuctridae genera and species are reported from North Korea for the first time and three species are new country records for South Korea. The number of stonefly species known from the Korean Peninsula is increased to 82. A key is presented for the Leuctridae species known from Korean Peninsula including taxa that are expected to occur. Distributional maps are presented and additional notes on the habitats of Korean Leuctridae are given.