Three new species of the genus Nemoura Latreille, 1796: Nemoura alticalcaneum Mo, Wang & Li, sp. n., Nemoura ganeum Mo, Yang & Li, sp. n. and Nemoura tauripitis Mo, Li & Murányi, sp. n., are described from Guangxi Zhuang Autonomous Region of China. Eight new province records from Guangxi, two new province records from Guangdong and one new province record from Hunan are given, among them one new for China as well. The newly recorded species are depicted and complementary descriptions provided, including the first female description of seven species and first egg description of two species. The paper is completed with an updated checklist of Guangxi stoneflies, distribution of species richness across prefectural cities in Guangxi, with distribution maps for each species.

Two new species of the Amphinemura sinensis group (Plecoptera: Nemouridae) from southern China

A new species of the Neoperla diehli subgroup of the montivaga group, N. curvilobata sp. nov., is described from Guangxi Zhuang Autonomous Region of southern China. The first country records for N. diehli Sivec, 1985 and N. hubleyi Stark & Sivec, 2008 from China are given. Neoperla wui Yang & Yang, 1990 is reported again from the type locality. Neoperla mesostyla Li & Wang, 2013 (in Wang et al. 2013b) is placed as a synonym of N. wui. Illustrations and color images are provided for each species and the new species is compared with related congeners of the N. diehli subgroup. A provisional key to the known species of the N. diehli subgroup is also presented.

Two new nemourid species, Amphinemura meizhouensis sp. n. and A. tulipa sp. n., are described from Guangdong Province and Guangxi Zhuang Autonomous Region, respectively. Four larvae of the stonefly subfamily Amphinemurinae, A. bifascia Mo, Wang, Yang & Li, 2020, A. hamiornata Li & Yang, 2008, A. yao Mo, Yang, Wang & Li, 2017, and Indonemoura scalprata (Li & Yang, 2007) are described and illustrated on the basis of recently collected specimens from southern China. The female adult of A. hamiornata is also described from the type locality. Both new species are typical members of the A. sinensis (Wu, 1926) species group and the taxonomic relationships are discussed with related congeners.

The family Chloroperlidae is reported from Guangxi Zhuang Autonomous Region of southern China for the first time with a description of a new species of the genus Sweltsa, S. bilobata sp. nov. The new species is compared to two similar species.

A new species, Neoperla yiliangensis Mo, Li & Murányi, sp. nov., is proposed from Yunnan Province of southwestern China and compared with related congeners. An additional species, Neoperla forcipata Yang & Yang, 1992 is reported from Yunnan Province for the first time and the first descriptions of aedeagal sac and female are also presented.