Oreta trispina Watson, 1967

Figs. 25–26, 75–76, 114, 145, 169

Oreta trispina Watson, 1967, Bull. Br. Mus. nat . Hist. (Ent.), 19: 177, figs 36–39, pl.2: 98, 99. Holotype 3, China: S. Shensi, Tapaishan im Tsinling (ZFMK).

Material examined. CHINA, Shaanxi (ZFMK): S. Shensi, Tapaishan im Tsinling, 6.VII.1935, coll. Höne, 13 (Holotype). Shaanxi (IZCAS): Ningshan, Huoditang, 1580 m, 26.VII.1998, coll. Yuan Decheng, 13. Ningxia (IZCAS): Jingyuan, Hongxia Linchang, 1998 m, 9–10.VII.2008, coll. Song Wenhui, 13. Gansu (IZCAS): Wenxian, Qiujiaba, 2350 m, 21–22.VII.1999, coll. Yao Jian and Zhu Chaodong, 53. Sichuan (IZCAS): Wolong, 1900 m, 20.VIII.1980, coll. Liu Youqiao, 1Ƥ; Nanping, Jiuzhaigou, 2350 m, 7.IX.1983, coll. Niu Chunlai, 1Ƥ; Balangshan, 2300 m, 7.VIII.1983, coll. Zhang Xuezhong, 1Ƥ.

Diagnosis. There are two forms of wing pattern in O. trispina, and both the yellow and brown forms are similar to O. liensis . In O. trispina, the forewing apex is more protruding; the oblique line from the apex to hind margin is more distinct than in O. liensis . The male genitalia are similar to O. ancora and O. flavobrunnea, but the valva is shorter in O. trispina . The valva has no distal process in O. trispina or O. ancora but two processes in O. flavobrunnea; the sacculus of these three species bears a forked process, but it diverges at the base and is decorated with small teeth in O. trispina and O. ancora, while it diverges at the middle and is smooth in O. flavobrunnea . In addition, O. trispina has another pointed process on the middle of the ventral margin of the valva, which is absent in the other two species. The posterior process of the aedeagus is blunt in O. trispina, but tapering and pointed in O. flavobrunnea, and very large and blunt in O. ancora .

Distribution. China (Shaanxi, Ningxia, Gansu, Sichuan).

Remarks. Some material published in Chu & Wang (1987, 1991) under O. trispina is referrable to O. flavobrunnea (Yunnan) and O. extensa (Fujian), no specimen of trispina has been found from Shanxi. The material from Gansu and Ningxia has slight differences in the male genitalia. The former (Fig. 72) has asymmetrical saccular processes with two spines on the ventral process of the left, and two spines at the base of the diverging branches on the right. The latter (Fig. 73) has symmetrical saccular processes on both valvae, and each bears four spines at the base of the diverging branches. In addition, the posterior process of the aedeagus is longer and blunt in the former, but short and truncate in the latter.