Promalactis digitiuncata Wang, 2019

Wang, Shuxia & Liu, Chen, 2019, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera Oecophoridae) V. The unistriatella species group, with descriptions of seven new species, Zootaxa 4668 (4), pp. 588-598 : 591-592

Promalactis digitiuncata Wang , sp. nov.

(Figs 2, 9, 16)

Type material. CHINA, Guangxi Zhuangzu Autonmous Region: Holotype ³, Mt. Daming , 1200 m, 5.VIII.2011, coll. Shulian Hao and Yinghui Sun , slide No. DZH12212. Paratypes (4³, 17 ♀): 3³, 12 ♀, 5‒7.VIII.2011 , other same data as holotype, slide Nos. DZH11056 ♀, DZH11057³, DZH12213 ♀, DZH12337³, JYY17548³, JYY17549 ♀; 1♀, Shanding, Mt. Daming , 1500 m, 27.VIII.2012, coll. Xiaofei Yang and Zhenguo Zhang ; 1³, Yangmeiao, Huan- jiang County , 1180 m, 23.VII.2015, coll. Meiqing Yang and Jiaen Li , slide No. JYY17528 ; 1♀, Yinshan Park, Dayaoshan, Jinxiu , 1364 m, 19.VII.2015, coll. Mujie Qi and Shengnan Zhao ; Fujian Province: 1♀, Sangang, Mt. Wuyi , 740 m, 27.VII.2008, coll. Weichun Li, Yongling Sun and Haiyan Bai , slide No. DZH10013 ; 1♀, Guadun, Mt. Wuyi , 1100 m, 29.VII.2008, coll. Weichun Li, Yongling Sun and Haiyan Bai ; Zhejiang Province: 1♀, Mt. Jiulong, Lishui , 509 m, 28.VIII.2017, coll. Shuonan Qian, Yanyan Jia and Juan Li.

Diagnosis. This species can be distinguished from its congeners by the forewing having a dark antemedian fascia, the sacculus with a stout thumb-shaped process at dorsal 1/ 3 in the male genitalia, and the sulciform lamella postvaginalis with irregularly shaped lateral plates posteriorly in the female genitalia.

Description. Adult (Fig. 2). Wingspan 8.0‾9.0 mm. Head with vertex snowy white, frons grey, occiput dark ochreous brown. Labial palpus with second segment dark brown on outer surface, basal half white and distal half ochreous brown on inner surface; third segment white except black at apex. Antenna with scape white; flagellum white annulated with black dorsally, dark brown ventrally. Thorax and tegula dark ochreous brown. Forewing ochreous brown, covered with dense deep slivery-grey and sparse black scales on basal 1/3; antemedian fascia deep grey, from basal 2/5 of costal margin to basal 3/5 of dorsum, inner margin edged with greyish white scales, outer margin with dense black scales and widened anteriorly; cilia ochreous yellow except dark grey on distal part of costal margin. Hindwing and cilia grey. Foreleg black; midleg grey ventrally, black dorsally, tibia with a tuft of dark grey scales apically; hindleg yellowish white ventrally, grey dorsally; tarsi white at apex of each tarsomere dorsally.

Male genitalia (Fig. 9). Uncus heavily sclerotized, narrow digitate, curved ventrad. Tegumen extremely narrowed anteriorly. Valva sub-triangular, densely setose on distal 4/5; costa concave at base, distinctly convex near base. Sacculus uniformly wide, separated from valva from distal 1/4, rounded apically; stout thumb-shaped process set at dorsal 1/3, with dense short setae at apex and along outer margin. Saccus triangular, about 1/2 length of uncus. Juxta sub-quadrate, weakly sclerotized; anterior lobe slender, reaching near anterior margin of saccus. Aedeagus slightly arched ventrally; cornutus spine-like, curved, placed distally.

Female genitalia (Fig. 16). Apophyses anteriores very short, about 1/5 length of apophyses posteriores. Lamella postvaginalis sulciform, anterior 1/4 sub-quadrate, posterior 3/4 with an upright, irregularly widened lateral sclerite. Ductus bursae membranous, widened anteriorly, slightly shorter than corpus bursae. Corpus bursae membranous, elongate ovate; signum irregularly shaped, bearing a conspicuous thorn mesially.

Distribution. China (Fujian, Guangxi, Zhejiang).

Etymology. The specific epithet is derived from the Latin prefix digit-, and the Latin word uncatus, referring to the digitate uncus.