Periacma leyensis Wang & Li, 2006

Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, Journal of Natural History 40 (41 - 43), pp. 2371-2393 : 2387-2388

Periacma leyensis Wang & Li , sp. nov.

( Figures 29 , 34 and 43 )

Holotype: „, China: Leye (24 ° 47 9 N, 106 ° 34 9 E), Guangxi Zhuangzu Autonomous Region , 1160 m, 26 July 2004, coll. Jiasheng Xu, genitalia slide No. W04091.

Paratype: 1 ♀, same data as holotype .

Description: Wing expanse 11.0–12.0 mm. Head whitish yellow. Labial palpus mostly ocherous in male, whitish yellow in female; male second segment dorsally with dark brown scales, forming a somewhat longitudinal dark line in distal 3/5; female second segment with dark brown scales near end, forming a dark ring, third segment about 3/5 as long as second, long and thin, pointed apically. Antenna mostly brown. Thorax, tegula, and fore wing light yellow, with scattered brown scales throughout. Fore wing lanceolate ( Figure 29 ); apex rounded; termen gently oblique; dark brown blotch extending from base of posterior margin obliquely upward to base of cell at middle, forming a somewhat arched band; brown spot at middle of cell and at 3/5 of fold; brown fascia from distal 1/3 of costa extending outward to before tornus; apex with large brown patch; cilia whitish yellow, gray around tornus. Hind wing and cilia gray. Legs light grayish white, tibiae and tarsi with brown speckles; spurs light ocherous yellow.

Male genitalia ( Figure 34 ): Uncus narrow in basal half, parallel-sided, laterally with strong setae near base; distal half roundly dilated. Gnathos with lateral arm somewhat triangular in shape, about 1/2 length of ventral plate; ventral plate with posterior half narrow, gradually widened from about middle to anterior margin, spinulate in anterior 1/3; anterior margin blunt. Valva narrow, slightly widened toward apex; apex rounded; dorsoproximal process long, narrow in basal 1/3, distal 2/3 wider. Sacculus about half as long as valva, irregularly triangular, dorsally with a sclerotized process at apex directing upward; ventral margin sinuate, with sclerotized edge. Saccus large, semicircular. Aedeagus narrow in basal 1/6, expanded from 1/6 to about 1/2; distal half strongly curved, with processes at about 5/6 and at apex.

Female genitalia ( Figure 43 ): Papilla analis somewhat triangular. Apophysis posterioris about twice as long as apophysis anterioris. Lamella postvaginalis large; posterior margin slightly concave at middle, sparsely lined with strong setae; anterior margin sclerotized, gently concave inward, laterally with sclerotized leaf-like process extending forward; lamella antevaginalis large, irregularly rectangular, weakly sclerotized. Ostium bursae with anterior margin sclerotized. Ductus bursae membranous, shorter than corpus bursae. Corpus bursae irregularly elliptical, membranous; signum quite small, with sclerotized spines, anteriorly with two large distinct thorns.

Remarks: This species is closely related to Periacma maekhongensis , but can be distinguished by the lamella postvaginalis anteriorly possessing two sclerotized leaf-like processes extending downward from the anterior angles in the female genitalia.

Etymology: The specific name is from the type locality, Leye, Guangxi Zhuangzu Autonomous Region.

Figures

Figures 24–32. Adults of Periacma spp. (24) P. weishana Wang & Li, „; (25) P. kangdingensis Wang & Li, ♀; (26) P. bifurcata Wang & Li, „; (27) P. immaculata Wang & Li, „; (28) P. plumbea Meyrick, „; (29) P. leyensis Wang & Li, sp. n., „; (30) P. latizona Wang & Li, sp. n., „; (31) P. spinivalvula Wang & Li, sp. n., „; (32) P. rectignatha Wang & Li, sp. n., „.

Figures 33–37. Male genitalia of Periacma spp. (33) P. plumbea Meyrick; (34) P. leyensis Wang & Li, sp. n.; (35) P. latizona Wang & Li, sp. n.; (36) P. spinivalvula Wang & Li, sp. n.; (37) P. rectignatha Wang & Li, sp. n.

Figures 38–43. Female genitalia of Periacma spp. (38) P. iodesma vietnamica Lvovsky; (39) P. zhouzhiensis Wang & Zheng; (40) P. binchuanensis Wang & Zheng; (41) P. equivalvata Wang, Li & Liu; (42) P. plumbea Meyrick; (43) P. leyensis Wang & Li, sp. n.; (44) P. latizona Wang & Li, sp. n.; (45) P. spinivalvula Wang & Li, sp. n.