Ankylopteryx stena Wu & Liu, 2024, sp. nov.

[13] Ankylopteryx stena sp. nov. (Figs 18, 79) Diagnosis. This species is characterized by the presence of the antennae without stripes, the pronotum, meso- and metascutum with brown spots on the anterolateral angle, the pro- and mesotibia with median black spot, and the male entoprocessus suddenly narrowed at middle and projected at tip. Description. Male. Body length 6.7–7.6 mm, forewing length 9.7–10.7 mm, hindwing length 8.8–9.6 mm. Head yellow, vertex raised. Compound eyes black. Scape wider than pedicel and flagellum. Clypeal margin with brown stripes. Gena with black spots. Maxillary and labial palpi brownish yellow. Pronotum anterior margin shorter than posterior margin, with small brown spots on anterolateral angle. Mesoscutum and metascutum with brown spots on anterolateral angle. Legs with dense setae. Pro- and mesotibia with median brown spot. Pretarsal claws brown, with basal dilation. Forewing broad, with brown shadings on pterostigma, basal crossvein of inner gradate series and CuP. Costal area broad basally, with 20–23 crossveins; 9–10 radial crossveins present. m1 smaller than m2, im quadrate; 7 psm-psc crossveins with pale brown shadings. c1 smaller than c2, dcc closed. A1 forked, A2 and A3 simple. Gradate series with pale brown shadings, inner gradate series with 5–6 crossveins, outer gradate series with 7 crossveins. Hindwing narrow, with pale brown shadings on gradate series. Pterostigma brown. Costal area with 15–17 crossveins; 7–8 radial crossveins and 6 psm-psc crossveins present. Inner gradate series with 4 crossveins, outer gradate series with 5 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, lateral arms narrow at base and wider at tip; entoprocessus attached at about basal 1/3 of gonarcus, suddenly narrowed at middle and projected at tip; pseudopenis widest near tip and curved. Female. Body length 7.5–8.2 mm, forewing length 10.0–12.0 mm, hindwing length 9.0– 11.1 mm. Sternum VII longer than tergum VII; tergum VII subquadrate in lateral view; tergum VIII shorter than tergum VII; tergum IX fused with ectoproct. Callus cerci ovoid. Subgenitale bilobed apically; spermatheca thick; vela and ventral impression absent; duct long and coiled. Type material. Holotype ♂, China, Hong Kong, Dayushan, Ho Pui Reservoir, V.9–11 (CAU). Paratypes: 1♀, China, Fujian, Xiamen, Siming District, Mt. Shanglishan, 2021.VI.12, Yuchen Zheng, (CAU); 1♀, China, Guangdong, Guangzhou, Haizhu National Wetland Park, 2021.IV.26–V.11 (CAU); 5♂ 2♀, China, Hong Kong, Dayushan, Ho Pui Reservoir, V.9–11 (CAU); 3♂ 1♀, China, Macau, Jiuao Reservoir, Jiaoye Park, 2014.IV.28, Hui Dong (CAU). Etymology. The specific epithet ‘ stena ’ refers to the entoprocessus of the new species suddenly narrowed at middle. Distribution. China (Macau, Fujian, Guangdong, Guangxi, Hong Kong). Remarks. This species has similar wing markings with A. hainanensis sp. nov. and A. octopunctata candida. The most important character to identify these species is the shape of male entoprocessus. The male entoprocessus of this new species is suddenly narrowed at middle, while in the other two species the entoprocessus is curved in dorsal view. This new species has brown spots on the anterolateral angle of the pronotum, meso- and metascutum, but A. hainanensis sp. nov. lacks the spots on metanotum. This new species lacks the spot below or between antennae, and the stripes on scape, but A. octopunctata candida usually has black spots below the antennae, and has interantennal spots and brown stripes on the outer side of scape.