One new species and one poorly known species of Neoperla in the montivaga group (Plecoptera: Perlidae) from Hainan Province, China Author Mo, Raorao 0000-0001-9480-092X Guangxi key laboratory of Agric-Environment and Agric-Products Safety and National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, Nanning, Guangxi 530004, China. & Department of Plant Protection, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China. & 1689832746 @ qq. com; https: // orcid. org / 0000 - 0001 - 9480 - 092 X 1689832746@qq.com Author Wang, Guoquan 0000-0003-1693-1654 Guangxi key laboratory of Agric-Environment and Agric-Products Safety and National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, Nanning, Guangxi 530004, China. & wangguoquan 0 @ 163. com; https: // orcid. org / 0000 - 0003 - 1693 - 1654 Author Li, Weihai 0000-0003-2803-4416 Department of Plant Protection, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China. & lwh 7969 @ 163. com; https: // orcid. org / 0000 - 0003 - 2803 - 4416 text Zootaxa 2021 2021-07-20 5004 2 385 394 journal article 10.11646/zootaxa.5004.2.7 1175-5326 5120615 8D3C8F7D-854C-4F8C-8AA8-18316A1A14E8 Neoperla hainanensis Yang & Yang, 1995 ( Fig. 6 ) Neoperla hainanensis Yang & Yang, 1995: 224 ; Du, Sivec & He, 1999: 62 ; Chen & Du, 2016: 244 ; Yang & Li, 2018: 40 ; Mo, Liu, Li & Shi, 2020: 375 . Supplementary description ( Fig. 6 ). Tergum 6 with a posteromedial patch of sensilla basiconica. Aedeagal tube strongly sclerotized, slightly curved ventrad, dorsally with spinules, and ventrally with a pair of short subapical nipple shaped lobes ( Figs. 6c–6d ). Aedeagal sac short, about 0.25X tube length, membranous, curved ventrally, and gradually tapering to a blunt tip; apical half covered by dense spinules ( Figs. 6c–6d ). Material examined . 1 male ( CAU ), China : Hainan Province , Ledong Li Autonomous County , Jianfengling Mountain , 18.7528 N , 109.1763 E . 800 m , 2013.IV.12 , Sun & Zhang . Distribution . China ( Hainan Province ). FIGURE 6. Neoperla hainanensis Yang & Yang, 1995 (male). a. Head and pronotum, dorsal view. b. Terminalia, oblique dorsal view. c. Aedeagus, lateral view. d. Aedeagus, ventral view. Remarks . The aedeagal sac of Neoperla hainanensis Yang & Yang, 1995 was not everted and described in the original description. The head pattern, the dorsal terminalia, and the aedeagal tube of this single male specimen agree well with figures provided by Yang & Yang (1995) . But our male specimen has a patch of sensilla basiconica on tergum 6 posteromedially, which is thought to be intraspecific variation. We provide additional illustrations to aid in the recognition of this southern China species.