Dusungwua strictivinculum Ren & Li, sp. nov.

(Figs 1, 13, 24, 34)

Type material. Holotype. [CHINA] ♂, Mt. Tianzhu, Xiamen (24°36’N 117°57’E), Fujian, 220 m, 24-VIII-2010, coll. Bingbing Hu & Jing Zhang. Paratypes. [CHINA] Fujian: 84 ♂♂, 83 ♀♀, same data as for holotype, except dated 13-VII̅ 24-VIII-2010, gen. slide Nos. LJY 10862m, LJY 10493 m, TKJ 14080 m, TKJ14079 f, LJY11372 f, TKJ 14091 m, LHX14176f; 2 ♀♀, Xiamen University (24°26’N 118°07’E), 85 m, 30-V-2010, 19-VI-2010, coll. Jing Zhang, gen. slide No. LLX11289 f; Guangxi: 1 ♂, 1 ♀, Jiman, Anchui (25°20’N 109°19’E), Rongshui County, 650 m, 2004-VII-16, coll. Jiasheng Xu, gen. slide Nos. LJY09168 m, LJY09167 f; 1 ♂, 1 ♀, Huaping, 950 m, 8- VIII-2006, coll. Weichun Li; 10 ♂♂ , 8 ♀♀, Mt. Yuanbao, 700 m, 11̅ 12-VIII-2006, coll. Weichun Li, gen. slide No. LJY 10524m; Hunan: 2 ♂♂, 3 ♀♀, Chengguan Town (28°31’N 112°09’E), Taojiang County, 26-VII-2004, coll. Yunli Xiao; 2 ♂♂ , 4 ♀♀, Maqiao, Baituo (27°49’N 112°56’E), Xiangtan city, 30-VII-2004, coll. Yunli Xiao, gen. slide Nos. RYD04819 m, RYD04820 f; 1 ♀, Yantang, Weishan, Xinhua County (27°36’N 111°18’E), 6-VIII- 2004, coll. Yunli Xiao; 2 ♂♂ , 3 ♀♀, Cangxi town, Xinhua County, 8-VIII-2004, coll. Yunli Xiao, gen. slide No. RYD04291 m; 1 ♀, Mt. Jinpen (25°00’N 114°51’E) , Jiangxi, 18-VII-2006, coll. Jiasheng Xu & Weichun Li.

Diagnosis. This new species can be differentiated from its allies by the viculum conspicuously constricted on anterior 1/ 3 in the male genitalia. It resembles D. paradichromella superficially, but differ in the male scape is 1.5 times as long as wide, the bell-shaped uncus, the finger-like postero-lateral lobe of the transtilla in the male genitalia, and the corpus bursae is double-kerneled peanut shaped in the female genitalia. In D. paradichromella, the male scape is 2.5 times as long as wide, the uncus is triangular, the postero-lateral lobe of the transtilla is right-angled triangle shaped, and the corpus bursae is elongate bag-shaped.

Description. Adult (Fig. 13) with wingspan 16.5̅22.0 mm. Head fuscous brown. Antenna brown, scape about 1.5 times as long as wide; male flagellum shallowly incurved basally, with a cluster of smaller scales. Labial palpus upturned just beyond vertex; first segment grayish white, second and third segments fuscous brown except whitetipped; second segment 1.7 times as long as third segment. Maxillary palpus brown. Patagium, tegula and thorax grayish brown. Forewing grayish brown, mottled with grayish white; antemedial line grayish white, from costal 1/3 from slightly oblique outward to dorsal 2/5, incurved at A, bordered outwardly by a black line and inwardly by an ovate, blackish brown patch near dorsum; discal spots blackish brown, fused, crescent; postmedial line grayish white, incurved at M 1 and CuA 2, edged outwardly with a grayish brown line and inwardly an indistinct broader band; terminal line black; cilia brown. Hindwing brown, cilia grayish brown. Foreleg blackish brown, mid and hindleg grayish brown mottled grayish white. Abdomen blackish brown, each segment darker in base than apex.

Male genitalia (Fig. 24). Uncus bell-shaped, about same length as width at proximal base. Gnathos about 5/8 length of uncus, tapered, apex slightly hooked. Transtilla produced in U shape posteriorly, postero-lateral lobe fingerlike, uniform in width, twice as long as width. Valva four times as long as wide, slightly narrower distally; clasper short and stout; costa clubbed, about 5/6 length of valva, apical 1/3 narrowed; sacculus 2/7 length of valva, sinuate in S shape, sharp at end. Juxta V-shaped; lateral lobe short, clubbed, as long as gnathos, three times as long as wide. Vinculum somewhat goblet-shaped, 1.4 times as long as maximum width, conspicuously constricted on anterior 1/3. Phallus stout, about same length as valva, with fascicle-shaped crimples.

Female genitalia (Fig. 34). Papillae anales large and wide, rounded at apex, with dense setae. Apophyses posteriores expanded at base, as long as apophyses anteriores. Eighth segment 1/3 as long as width. Antrum bowl-like, weakly sclerotized. Ductus bursae about half length of corpus bursae, smooth in posterior half, slightly broadened and granulated in anterior half. Corpus bursae twice as long as maximum width, double-kerneled peanut shaped, granulated near junction with ductus bursae; signum a rounded, invaginated cup consisting of concentrically arranged granules, situated at anterior 2/5 of corpus bursae. Ductus seminalis posterior margin of corpus bursae.

Distribution. China (Fujian, Guangxi, Hunan, Jiangxi).

Etymology. The specific name is derived from the Latin prefix strict-, meaning constricted, and the terminology vinculum, referring to the vinculum of this species is conspicuously constricted on anterior 1/3.