A new species of the perlodid genus, Isoperla Banks, I. sejila sp. nov., is described and illustrated from the Tibet Autonomous Region of southeastern China. The everted aedeagus of the male is described and the relationships with other species of this genus known from China are discussed.

The Capnia cordata species group (Plecoptera: Capniidae) is reviewed based on an integrative taxonomic approach that combines morphological and molecular methods. Within this group, two species are described as new to science: C. s. lat. bispina Cao & Li sp. nov. from Qinghai Province and C. s. lat. huanglong Cao & Li sp. nov. from Sichuan Province. Both are illustrated and compared with related taxa, and keys for both males and females of the species group are provided. The known localities of the C. cordata species group are mapped. Additionally, a phylogenetic analysis based on Cox1 sequence was conducted involving 14 species of the Capniidae family, supporting the distinctness of this species group.

A new combination of the genus Capniella Klapálek, 1920, C. khingana (Teslenko, 2019), comb. nov., is proposed from Heilongjiang Province. Isocapnia guentheri (Joost, 1970) from Heilongjiang Province of northeast China is recorded. Both species are recorded for the first time from China.

Two new species of the stonefly genus Sinacroneuria, S. aequalis sp. nov. and S. transversa sp. nov., are described and illustrated from the Fujian and Zhejiang provinces of China. These new taxa are compared with related congeners. A distribution map of the genus is also presented.