Semachrysa triloba Wu & Liu, 2024, sp. nov.

[64] Semachrysa triloba sp. nov. (Figs 73, 89) Diagnosis. This species is characterized by the presence of the frons with two pairs of black spots on lateral sides and a dark spot at middle, the mesonotum with small brown markings near posterior margin of prescutum and the anterolateral angle of scutum, the brown suture between mesoprescutum and mesonotum, the forewing with brown shadings on the 4th posterior margin crossveins, CuP and inner gradate series, the broad median arch of male gonarcus and entoprocessus, and the trifurcated arcessus elongated at middle and shortened at the lateral side. Description. Male. Body length 7.4–7.8 mm, forewing length 10.4–10.8 mm, hindwing length 9.1–9.5 mm. Head yellow, vertex raised. Compound eyes prominent and black. Frons with two pairs of black spots on lateral sides and a dark spot at middle. Antennae yellow, without stripes on outer side, scape wider than pedicel and flagellum. Clypeal margin with brown stripes. Gena marked black spots. Maxillary and labial palpi with brown stripes on outer side. Pronotum anterior margin slightly shorter than posterior margin, not marked; mesonotum with small brown markings near posterior margin of prescutum and anterolateral angle of scutum, suture between mesoprescutum and mesonotum brown; metanotum without markings. Legs with dense setae, without spots. Pretarsal claws brown, with basal dilation. Forewing with brown shadings on apical radial crossveins, CuP, 4th posterior margin crossveins and inner gradate series. Pterostigma indistinct. Costal area with 17–18 crossveins; 8–10 radial crossveins present. m1 smaller than m2; im ovoid; 7 psm-psc crossveins present. c1 smaller than c2, dcc opened. A1 forked, A2 and A3 simple. Inner gradate series with brown shadings, especially distal crossveins; outer gradate series with 6–7 crossveins. Hindwing without shadings. Costal area with 15–16 crossveins; 8 radial crossveins and 6 psm-psc crossveins present. Inner gradate series with 5 crossveins, outer gradate series with 6 crossveins. Abdomen with dense setae. Tergum VII and sternum VII subquadrate in lateral view; tergum VIII shorter than tergum VII; sternum VIII fused with sternum IX; tergum IX fused with ectoproct. Callus cerci ovoid. Gonarcus arcuate, median arch extremely broad, lateral arms narrow at base and wide at tip; entoprocessus broad; arcessus trifurcated, elongated at middle and shortened at lateral side. Type material. Holotype ♂, China, Yunnan, Gongshan, Dulong, Qinlandang, light, 1230 m, 2018.V.03, Yunlong Ma (CAU). Paratypes: 1♂, same as holotype (CAU); 1♂, China, Yunnan, Yuxi, Huaning, Qinglong, Hulukou Electrical Station, 960 m, 2018.V.14, Yunlong Ma (CAU). Etymology. The specific epithet ‘ triloba ’ refers to the trifurcated male arcessus of the new species. Distribution. China (Yunnan). Remarks. This species is similar to Se. pulchella from Japan. However, Se. pulchella has completely brown mesoprescutum and mesoscutum, the forewing with brown shadings only on 4th posterior margin crossveins, and the wide short male arcessus. This new species has small brown markings only near posterior margin of mesoprescutum and on the anterolateral angle of the mesonotum, the brown suture between mesoprescutum and mesonotum. It also has the forewing with brown shadings on the apical radial crossvein, CuP, 4th posterior margin crossveins and inner gradate series, and the narrower and longer male arcessus.