Contribution to the knowledge of Neoperla (Plecoptera: Perlidae) from Hainan Province of China Author Chen, Zhi-Teng Author Du, Yu-Zhou text Zootaxa 2016 4144 2 243 252 journal article 10.11646/zootaxa.4144.2.6 02de6342-d4bb-47c0-9675-474c54689576 1175-5326 264488 C96FA109-D9C0-40D0-BC00-F049C93B188B Key to males of species of Neoperla from Hainan Province , China . 1. Tergum 9 with a pair of small rounded nodules medially (see figs. 85–86 in Wu 1973 )...................... N. binodosa -. Tergum 9 without above mentioned nodules................................................................ 2 2. Hemitergal process of tergum 10 very long and sharp, reaching posterior margin of tergum 8 (see figs. 110–111 in Wu 1938 )........................................................................................... N. longispina -. Hemitergal process of tergum 10 not very long and sharp, not reaching tergum 8................................... 3 3. Tergum 7 with a sub-trapezoidal process, tergum 8 with an upcurved sclerite...................................... 4 -. Tergum 7 without sub-trapezoidal process, tergum 8 without upcurved sclerite..................................... 5 4. Aedeagus curved (see fig. 4 in Yang & Yang 1995 )................................................ N. hainanensis -. Aedeagus straight, process of tergum 7 with a pair of cornuted lobes laterally (see fig. 3 in Yang & Yang 1995 ).. N. bicornuta 5. Aedeagus without lobes ( Figs. 3–4 )......................................................... N. minuta sp. nov. -. Aedeagus with lobes................................................................................... 6 6. Aedeagus exhibits an S-shaped curve laterally (see figs. 3–4 in Kong et al. 2014 )......................... N. bicurvata -. Aedeagus not S-shaped................................................................................ 7 7. Aedeagus with only two small lobes ( Figs. 7–8 )........................................... N. wuzhishana sp. nov. -. Aedeagus with more than two lobes....................................................................... 8 8. Aedeagus with an elongated ventral lobe and two small dorsal lobes (see Figs. 5–6 in Kong et al. 2014 ).... N. furcomaculata -. Aedeagus with more than three lobes...................................................................... 9 9. Aedeagus with four small lobes and a large lobe (see figs. 1–2 in Kong et al. 2014 ).......................... N. baisha -. Aedeagus with four small lobes and two large lobes ( Figs. 14–16 ).............................. N. sexlobata sp. nov.