Sweltsa taibaishana Zhang, Li & Li, 2023

Sweltsa taibaishana Zhang, Li & Li , sp. nov.

(Figs. 4–5, 6c–6d)

Adult habitus. (Figs. 4a–4b). Generally pale in ethanol. Head: the typical brown cephalic marking large, continuous, laterally constricted near anterior ocellus and triangularly notched between posterior ocelli; compound eyes black, ocelli with dark rings; antennae pale, distal flagella brownish, scape and pedicel brown (Fig. 4a). Pronotum with continuous dark brown margins and obscure midline and paramedial markings. Wing membrane transparent (Fig. 4b); legs pale. Abdominal tergum 1 with anterior and lateral margins brown, and narrower median stripe, terga 2–7 with brown trapezoidal median stripe. Cerci pale with long setae.

Male. ( Figs. 5 View FIGURE 5 , 6c–6d View FIGURE 6 ). Forewing length 9.7 mm; hindwing length 8.4 mm. Tergum 8 with brown median band at anterior margin. Tergum 9: transverse ridge distorted, band-shaped ( Figs. 5a–5b View FIGURE 5 ). Sternum 9: subgenital plate tongue-shaped, with rounded posterior margin ( Fig. 5e View FIGURE 5 ). Epiproct recurved, slender and rod-like, medially slightly constricted, apex gently tapering in dorsal aspects; in lateral aspect up-curved distally, nearly parallel-sided at basal half, apex widened and truncate ( Figs. 5c–5d View FIGURE 5 , 6c–6d View FIGURE 6 ).

Female. Unknown.

Type Material. Holotype male ( CAU), CHINA: Shaanxi Province, Zhouzhi County, Qinling Mountains, Taibaishan National Natural Reserve , 1711 m, 33.8847 N, 107.8108 E, 2015.VII.30, Xuankun Li. GoogleMaps

Etymology. The specific name refers to the mountain Taibaishan where the holotype was collected.

Distribution. China ( Shaanxi Province).

Remarks. The epiproct of Sweltsa taibaishana sp. nov. is similar to S. baiyunshana Li, Yang & Yao, 2014 . However, S. taibaishana may be easily separated from S. baiyunshana by the following features: the median portion of epiproct is narrower than base and subapical portion in dorsal view; the swollen apical half is nearly parallel-sided in lateral view. In S. baiyunshana , the median portion of the epiproct is parallel-sided in dorsal view, and the apical 1/4 of epiproct is gradually enlarged; apically, the epiproct has an upraised tongue-like cap in lateral view.