Periacma plumbea Meyrick, 1919

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

Periacma plumbea Meyrick, 1919 New record for China

( Figures 28 , 33 and 42 )

Periacma plumbea Meyrick, 1919: 238 .

Redescription: Wing expanse 11.0–12.0 mm. Head ochreous yellow. Labial palpus ochreous yellow except second segment whitish on dorsal surface. Antenna pale orange yellow on ventral surface, brown on dorsal surface. Thorax and tegula ochreous yellow mixed with ochreous brown. Fore wing ochreous yellow, with ochreous brown scales throughout, somewhat erect and denser in distal third; with three distinct tufts of dark brown scales: one at middle of cell, other two placed one above another near end of cell; costa with a triangular dark brown spot just beyond middle; dorsum with a dark brown spot at base; elongate streak from near base extending along fold; cilia ochreous yellow tinged with grayish brown. Hind wing and cilia deep gray. Fore and mid legs ochreous brown, with dark brown spots; hind leg grayish yellow, with dark brown spots on tarsi.

Male genitalia ( Figure 33 ): Uncus elongate, somewhat narrowly contracted medially, rounded at apex. Gnathos longer than uncus, curved, heavily sclerotized, pointed apically. Valva narrow, nearly same width from base to apex, rounded at apex, with a row of large setae from near base and costa obliquely extending to 2/5 of dorsum; costa concave, with an elongate projection beyond middle; dorso-proximal process with long hairs distally. Sacculus somewhat broad triangular, about half as long as costa, apically produced to a hooked process directing upward. Saccus triangular. Aedeagus strong, divided into two branches from middle: ventral one strong and curved downward; dorsal one thin, slightly arched, pointed distally.

Female genitalia ( Figure 42 ): Papilla analis triangular, margined with long setae. Apophysis posterioris about 2.5 times length of apophysis anterioris. Lamella postvaginalis wide and spitulate; lamella antevaginalis protruding laterally. Ductus bursae short, about half length of corpus bursae. Corpus bursae large, elongate ovate; signum small, irregularly rounded.

Material examined: 7 „„, 8 ♀♀, Xinhua (27 ° 44 9 N, 111 ° 18 9 E), Hunan Province, 10–11 August 2004, coll. Yunli Xiao.

Distribution: China (Hunan), India.

Remarks: This species is closely related to P. erawanensis , but can be distinguished by the somewhat finger-like gnathos, the valva not expanded distally, and the aedeagus divided into two distal processes. In the latter species, the gnathos is triangularly shaped, the valva is medially expanded and the aedeagus bears three distal processes.

This species is reported from China for the first time.

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.