1 male (CAU), China: Guangxi, Fangcheng, Jinhuacha Nature Reserve, 21°76, 09'N, 108°43, 49'E, light trap, 15 May 2013, G.Q. Wang.

Forewing length 12.6 mm. Distance between ocelli about 1.5× as wide as diameter of the ocellus. Head pale yellow, slightly wider than pronotum, with a black area covering ocelli which extends forward to contacting a quadrate black stigma on frons (Fig. 1a); compound eyes black and antennae dark except scape pale; maxillary palpi brownish. Pronotum with obscure rugosities and pale lateral margins, meso- and metathorax mostly brown (Fig. 1a); wing membrane subhyaline, veins brown; legs dark brown with femora pale brown, but distal fourth of foreleg femora dark brown (Fig. 1e).

Terminalia. The posterior margin of tergum 7 with a trapezoidal sclerotized area extended into a rounded quadrate process covered with distal sensilla basiconica (Fig. 1b). Tergum 8 with two median weak humps covered by sensilla basiconica (Figs 1b). Tergum 9 with two patches of sensilla basiconica. Hemitergal processes of tergum 10 sclerotized, with rod-like base and sharp apex (Fig. 1b). Aedeagal tube membranous with a weak basodorsal sclerite, apically with a pair of separate dorsal spinous lobes covered by small spines connected with two lateral spinous bands, in lateral view the lobes plump and nipple like (Figs 1c–d, 2). Aedeagal sac slightly longer than tube, essentially straight along with tube in outline; two spinulose dorsal patches present at slightly swollen base, single ventral lobe without spines, located near midlength of sac, a pair of mesolateral protrusions rounded, covered by large spines and two nearby elevated dorsal lobes triangular in lateral view covered with tiny spines; distal portion of sac with two rows of large spines which extend laterally below the apical fine spinules (Fig. 2).

Unknown.

The specific epithet refers to the lateral spinous patch of aedeagal sac.

China (Guangxi).

Neoperla latispina belongs to oculata species complex defined by Zwick (1986) in the montivaga species group (Zwick 1983) which includes species bearing a similar T7 lobe and several lobes, protrusions or finger shaped extensions of the aedeagal sac (see figs 1–2 and figs 51–63 in Zwick 1986 for comparison). This species shares dorsal lobe characteristics of the aedeagal tube with Neoperla securifera Zwick 1986 and Neoperla multilobata Zwick 1986 (figs 57 & 59 in Zwick 1986). Neoperla latispina also shares a straight outline of the extruded aedeagus with Neoperla multilobata whereas the sac of Neoperla securifera stands at right angle to tube. However, the dorsal lobes of aedeagal tubein Neoperla latispina are paired but that of Neoperla multilobata is single. Additionally, Neoperla latispina bears only single ventral lobe near midlength while Neoperla multilobata has spinous ventrobasal and ventrodistal lobes (fig. 59 in Zwick 1986).

Holotype: 1 male (HIST), Guangxi, Fangcheng, Jinhuacha Nature Reserve, 21°76, 09'N, 108°43, 49'E, light trap, 16 April 2012, G.Q. Wang. Paratypes:2 males (HIST), same as holotype; 1 male (CAU), same locality, 2013. May 15, G.Q. Wang.

Forewing length 11.1–11.3 mm. Distance between ocelli about as wide as diameter of the ocellus. Head mostly yellow brown, lateral margins and frons pale, a subquadrate dark area covering ocelli, slightly wider than pronotum; antennae brown; compound eyes dark; mouthparts brown (Fig. 3a). Thorax brownish with darker median stripe and scattered rugosities, legs brown; wings pale. Abdomen brownish yellow.

Terminalia. Tergum 7 with an elevated trapezoidal median process at posterior margin, which is covered by many tiny sensilla basiconica. Process of tergum 8 moderately sclerotized, recurved backward and tougue–shaped, lateral marings with tiny spines. Tergum 9 without sensilla patches. Hemitergal processes of tergum 10 strongly sclerotized and with slightly curved apex (Figs 3a, b). Aedeagal tube long and slender, relatively straight and moderately sclerotized, medially with a nipple-like process in ventral surface; everted sac strongly curved ventrad as a loop, about half as long as tube, irregular rows of small to median sized spines present along dorsal and lateral surfaces from medial portion to apex of the sac (Figs 3d & 4).

Unknown.

The specific epithet refers to the location of the nipple-like process on the aedeagal tube.

China (Guangxi).

The new species seems closely related to Neoperla dao Stark & Sivec, 2008, a recently described species from Vinh Phu Province of Vietnam. They are very similar in head pattern, general features of male terminalia and the aedeagal tube. However, the new species can be easily separated from Neoperla dao Stark & Sivec by the relatively long (about half as long as tube) and strongly curved aedeagal sac in lateral view. In Neoperla dao Stark & Sivec, the sac is very short, somewhat straight and triangular in outline (fig. 22 in Stark and Sivec 2008). There are no other Chinese species of Neoperla that appear related to Neoperla mesospina.

2 males (HIST), China: Guangxi, Fangcheng, Jinhuacha Nature Reserve, 21°76, 09'N, 108°43, 49'E, light trap, 2013. May 15, G.Q. Wang.

China (Guangxi).

This species was originally described by Du and Sivec (2004). 2 males were available to the present study and only the tip of sac shows a slight difference with original drawing (fig. 4 in Du and Sivec 2004). The dorsal patch of subapical spines in the present material seems prominent than as in original drawing.

1 male (HIST), China: Guangxi, Fangcheng, Jinhuacha Nature Reserve, 21°76, 09'N, 108°43, 49'E, light trap, 2012. April 16, G.Q. Wang.

Vietnam, China (Guangxi, Guangdong).

This species was originally described by Stark (1987) from Vietnam and China based on three males (two from Vietnam, one from China), its female was recently associated (Stark and Sivec 2008). One male was available to the present study and the tip of sac seems slightly hooked with sharper apex that appears somewhat blunt in original drawing (fig. 6 in Stark 1987).