Meleonoma apicitriangula Zhu & Wang, 2026, sp. nov.

Meleonoma apicitriangula sp. nov. Figs 2, 15, 27 Type material. Holotype: China • ♂; Xizang Autonomous Region [Tibet], Bomi County, Tongmai Town; 30.10°N, 95.08°E; 2029 m a. s. l.; 12 VII. 2018; Mujie Qi leg.; slide no. ZXJ 19482, in NKU. Paratypes: • 3 ♀; same data as for holotype; slide nos. ZXJ 19506, ZXJ 19629, in NKU 7 ♂ 8 ♀; 13–16 VII. 2018; other data same as for holotype, in NKU 2 ♂ 5 ♀; • Xizang Autonomous Region [Tibet], Motuo County [Mêdog]; 2089 m a. s. l.; 6–19 VIII. 2017; Mujie Qi & Xiaofei Yang leg.; slide no. ZXJ 19483 ♂, in NKU 5 ♂ 4 ♀; • Xizang Autonomous Region [Tibet], Motuo County [Mêdog]; 2076 m; 28 VII – 9 VIII. 2018; Mujie Qi leg.; slide no. ZXJ 19484 ♂, in NKU 3 ♂ 3 ♀; • Xizang Autonomous Region [Tibet], Pailong; 2031 m a. s. l.; 18 VIII. 2018; Mujie Qi leg.; slide no. ZXJ 19485, in NKU 2 ♀, • Xizang Autonomous Region [Tibet], nielamu County, Zhangmu Town; 1961 m a. s. l.; 5–8 VII. 2019; Mujie Qi & Jiaqi Deng leg.; in NKU. Diagnosis. The new species is similar to M. proapicalis Wang, 2021 (Wang, Zhu and Tao 2021) in male genitalia. It can be distinguished by the costal part of the valva with a spine at the ventral angle, and with a triangular plate before apex on the ventral margin in the male genitalia, and the spine-shaped signum in the female genitalia. In M. proapicalis, the costal part of the valva lacks a spine at the ventral angle, lacks a plate before apex on the ventral margin, and the signum is narrowly elongate. It is also similar to M. anisomorpha sp. nov., and the differences between them can be found in the diagnosis of M. anisomorpha sp. nov. Description. Forewing length 7.5–8.5 mm (Fig. 2). Head with frons dark brown, vertex pale yellow, occiput pale yellow mixed with dark brown. Labial palpus dark brown; second segment with a yellow dot distally on inner surface, forming a yellow ring at apex; third segment ~ 1 / 2 length of second segment, yellow on dorsal and inner surfaces. Antenna dark brown; scape yellow at apex; flagellum alternated with whitish yellow on ventral surface. Thorax and tegula dark brown. Forewing with costal margin arched, apex rounded; dark brown, with a yellow spot at base; median fascia yellow, with scattered greyish brown scales, from before middle of costal margin extending obliquely outward to before tornus, narrower anteriorly; distal spot yellow, with scattered greyish brown scales, inverted triangular, placed beyond distal 1 / 3; dorsum with yellow scales basally, forming a spot; plical spot black, at middle of fold, placed at inner margin of median fascia; discal and discocellular spots black, discal spot ovate, placed at inner margin of median fascia, discocellular spot larger, banded, placed at outer margin of median fascia; fringe dark brown, with a yellowish white basal line. Hindwing and fringe brown. Legs yellowish white, with exceptions on ventral surface: coxa and femur of foreleg brown, femora of mid- and hindlegs with scattered brown scales, tibiae of fore- and midlegs dark brown except yellow at middle and at apex, tibia of hindleg with scattered dark brown scales, tarsus of foreleg dark brown except yellow at apices of basal two tarsomeres, tarsus of midleg dark brown except yellow at apices of basal two tarsomeres and yellow at apical tarsomere, tarsus of hindleg with basal three tarsomeres dark brown except yellow at base of basal tarsomere and at apices. Abdomen: Male genitalia (Fig. 15). Uncus wide at base, narrowed near base, then widened from near base to apex, with dense long setae distally. Tegumen narrowed medially; lateral arm uniform, blunt at apex. Costal part of valva narrow at base, gradually widened to basal 2 / 3, thereafter narrowed to apex; apex obtuse, with a spine at ventral angle; ventral margin heavily sclerotised, folded dorsad basally, forming two layers, dorsal layer dentate distally, with a preapical spine, placed at basal 2 / 3, with a triangular plate before apex, dentated distally, ventral layer short, dentated in distal 3 / 4; costa produced distally; transtilla clavate. Sacculus triangular; dorsal margin with a band, folded ventrad, sinuate; ventral margin folded dorsad and lined with long setae in distal 2 / 5; with a setose plate at base. Saccus broad, ~ 2 × length of uncus. Juxta U-shaped. Aedeagus ~ 2 × length of costal part of valva, tubular in basal 1 / 3, distal 2 / 3 narrower, with fine wrinkles, with a process before apex, densely with tiny spines; cornuti being a row of spines, placed at beyond middle. Female genitalia (Fig. 27). Papillae anales subquadrate, with sparse setae dorsally. Apophyses posteriores ~ 3 × length of apophyses anteriores. Eighth tergite subtrapezoidal. Eighth sternal plate spiculate; with a median groove, laterally with a triangular plate, narrowed to posterolateral corner, lined with long setae on posterior margin. Antrum trapezoidal, deeply concave medially on ventral surface, obtuse on inner margin. Ductus bursae weakly sclerotised, membranous anteriorly. Corpus bursae large, with an ovate plate anteriorly; ductus seminalis arising from middle of corpus bursae; signum long spine-shaped, with a subovate base. Distribution. China (Xizang Autonomous Region [Tibet]). Etymology. The specific epithet is derived from the Latin apic - and triangulus, referring to the costal part of the valva with a triangular plate before apex in the male genitalia.