Opacoptera Gozmany (Lepidoptera, Lecithoceridae) from China, with descriptions of four new species Author Yu, Shuai https://orcid.org/0000-0003-3670-2701 School of Life Sciences, Liaocheng University, Liaocheng 252000, China & College of Life Sciences, Nankai University, Tianjin 300071, China Author Wang, Shuxia https://orcid.org/0000-0002-9316-6661 College of Life Sciences, Nankai University, Tianjin 300071, China shxwang@nankai.edu.cn text ZooKeys 2023 2023-04-21 1158 133 146 http://dx.doi.org/10.3897/zookeys.1158.100396 journal article http://dx.doi.org/10.3897/zookeys.1158.100396 1313-2970-1158-133 649720BFA67C4633B29C9594C807B3E3 0619FFEFB19F528A8D337C3589ADB21F Opacoptera longissima Yu & Wang sp. nov. Figs 10 , 17 Type material. Holotype : China : ♂, Yunnan, Tengchong, Cuanlong Village ( 25°19'N , 98°42'E ), 1329 m, 10.viii.2015, KL Liu & JX Zhao leg., slide No. YS19422. Paratypes : China : 2♂, same data as holotype. Diagnosis. The new species can be distinguished from its congeners by the ventrobasally serrate cucullus and the apices of the posterior lobes of the juxta extending beyond the middle of the tegumen. Description. Wingspan 13.0-14.0 mm (Fig. 10 ). Head dark brown. Antenna orange yellow, paler distally. Labial palpus orange yellow except third palpomere dark brown ventrally; third palpomere as long as second palpomere. Thorax and tegula dark brown. Forewing dark brown, with diffused black scales distally; with two ill-defined black patches at basal 1/4 and middle respectively; fringe dark brown; CuA1 and CuA2 short-stalked. Hindwing and fringe brown; fringe with an orange white basal line. Male genitalia (Fig. 17 ). Uncus subrectangular, semicircularly concave on posterior margin; caudal lobe seimiovate. Gnathos with median process wide at base, narrowed to middle, slendered from middle to pointed apex, curved ventrad at distal 1/4 by a right angle. Valva wide at base, narrowed slightly to cucullus; cucullus about half length of valva, narrowed to obtusely rounded apex, costal margin expanded dorsad basally, ventral margin serrate ventrobasally and gently concave at middle; costal bar narrow, slightly arched, triangularly produced at middle on dorsal margin; sacculus narrow basally, widened distally, about 1/4 length of ventral margin of valva. Saccus rounded on anterior margin. Juxta deeply concave in V-shape on posterior margin, with a papillary process at middle on anterior margin; posterior lobe large horn-shaped, extending beyond middle of tegumen apically; posterolateral lobe small, narrowly banded, extending posterolaterally. Aedeagus nearly as long as valva, slightly widened medially, with two dorsal denticles; cornuti consisting of three large needle-like spines. Female unknown. Distribution. China (Yunnan). Etymology. The specific name is derived from the Latin longissimus , referring to the long posterior lobe of the juxta.