Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species Author Wang, S. X. Author Li, H. H. text Journal of Natural History 2006 2006-12-28 40 41 - 43 2371 2393 http://dx.doi.org/10.1080/00222930601088123 journal article 10.1080/00222930601088123 1464-5262 5231741 Periacma equivalvata Wang, Li & Liu, 2001 ( Figures 21 and 41 ) Periacma equivalvata Wang, Li & Liu, 2001: 273 . Wing expanse: 15.0–16.0 mm. Female genitalia ( Figure 41 ): Papilla analis bluntly rounded caudally, with strong setae. Apophysis posterioris about three times as long as apophysis anterioris. Lamella postvaginalis with caudal margin concave at middle, forming two rounded processes. Ductus bursae well developed, shorter than corpus bursae. Corpus bursae irregularly oval; signum minute, with a tiny anterior spine. Material examined: Holotype : „ , Mt. Jiulian ( 24 ° 38 9 N , 114 ° 33 9 E ), Jiangxi Province , 24 May 1977 . Additional material: 1 „ , 1 ♀ , 22 May 1977 , same locality data as holotype ; 1 ♀ , Guangzhou ( 23 ° 08 9 N , 113 ° 14 9 E ), Guangdong Province , 1 May 1978 . Distribution: China ( Guangdong , Jiangxi ). Remarks: This species can be separated from other members of the genus by the gnathos nearly annular, the valva nearly parallel-sided from the base to the apex, and the aedeagus with distal portion produced into two large, densely spined processes. The female genitalia of this species are described for the first time.