Sweltsa zhejiangensis Li, W.H. & Wang, sp. nov.

(Figs. 1b, 1f–1h & 3)

Adult habitus (Figs. 1b, 1f). Body generally pale in ethanol. Head pale, with a median brown marking covering ocellar area to frons, posteromedial area of the spot rectangular; head about as wide as pronotum. Compound eyes black, ocelli with dark rings; antennae pale brownish, basal segments pale (Fig. 1b). Pronotum with wide, brown median stripe and rugosities, pale lateral margins narrow. Wing membrane transparent; legs pale. Abdominal terga 1–7 with a wide pale brown median stripe (Fig. 1f). Cerci 9-segmented. Setae of dorsal surfaces and lateral margins of segments 1–4 are of subequal length, and longer than the length of each segment; distal setae of segments 5–9 longer than the basal setae of every segment.

Male (Figs. 1f–1h & 3). Forewing length ca. 7.7–8.4 mm; hindwing length ca. 6.6–6.9 mm. Tergum 8 with a brown anteromedial marking. Tergum 9 with band like transverse ridge (Fig. 1f). Sternum 9 with a tongueshaped subgenital plate (Fig. 3e). Epiproct widened toward triangular apex in dorsal aspect; epiproct recurved, distal portion distinctly swollen, with a keel that is widest subterminally and ending in a blunt tip, and dorsal surface nearly straight for entire length, ventral surface of apex rounded in lateral aspect (Figs. 1g –1h, 3a–3d).

Female (Figs. 3f– 3g). Subgenital plate on sternum 8 extends over half sternum, and emarginate in ventral view.

Type Material. Holotype: male (CAU), CHINA: Zhejiang Province, Longquan City, Fengyangshan, N 27°53.52’, E 119°9.95’, 1450 m, malaise trap, 2007.VII.6, Yajun Zhu . Paratypes: 1 female (HIST), same data and date as holotype; 2 males (HIST), China: Zhejiang Province, Longquan City, Fengyangshan, Longquan Grand Canyon, N 27°53.52’, E 119°9.95’, 1450 m, 2021.IV.29, Xulong Chen .

Etymology. The specific name refers to the Zhejiang Province where the type locality was located.

Distribution. China (Zhejiang Province).

Remarks. Sweltsa zhejiangensis sp. nov. is similar to Sweltsa bilobata Mo, Ye, Wang & Li, 2020 in lateral epiproct and female subgenital plate shape. However, S. zhejiangensis can be easily distinguished from S. bilobata by the following features: the epiproct is gradually widened from base to subapical part in dorsal view; female subgenital plate extends over half the length of sternum 9. In S. bilobata, the epiproct is slightly constricted at median length and tapers evenly to the tip in dorsal view; the female subgenital plate nearly reaches the posterior margin of sternum 9 (figs. 2–6 in Mo et al. 2020).