Biston quercii (Oberthuer, 1910) Figs 44, 4583110

Amphidasis quercii Oberthür, 1910, Études Lépid . comp., 4: 676, pl. 51, fig. 433. Holotype ♀, China: Sichuan, Tien-Tsuen. (ZFMK)

Biston quercii: Prout, 1915, in Seitz, Macrolepid. World, 4: 359.

Biston (Eubyjodonta)quercii: Wehrli, 1941, in Seitz, Gross-Schmett. Erde, 4 (Suppl.): 434, pl. 36: f.

Diagnosis.

The wing pattern of this species is similar to that of Biston falcata as follows: the forewing antemedial line is black, slightly waved; the postmedial lines of both wings are black and dentate; broad brown bands are present basally of the forewing antemedial line and distally of the postmedial lines of both wings; the speckles scattered on the wings are black, and often gather to a black patch basally of the submarginal lines; the hindwing medial line is black and double. But it can be distinguished by the fol lowing characters: the outer margins are more undulating, there are distinct marginal processes in the centre of both wings, absent in Biston falcata; the hindwing discal spot is present. The male genitalia are similar to those of Biston falcata as follows: the apex of the uncus is round; the median process of the gnathos is broad and round apically; the juxta is long, narrow, acute and with a longitudinal arris apico-ventrally; the cornutus is shaped as a spinous patch. But this species is characterized by the narrower juxta and the longer spines of the cornutus.

Material examineds.

CHINA, Sichuan (ZFMK): Tien-Tsuen, 1901, coll. native collectors (chasseurs indigènes de feu le P. Déjean), 1♀ (Holotype). Henan(IZCAS): Baiyunshan, 1300 m, 19.VII.2002, 18.VI.2003, coll. Shen Xiaocheng, 2♂. Shaanxi(IZCAS): Ningshaan, Yaquegou, 1580-1750 m, 7.VII.1999, coll. Yuan Decheng, 1♂. Gansu(IZCAS): Kangxian, Qinghe Linchang, 1450-1650 m, 15.VII.1998, coll. Yao Jian and Wang Hongjian, 4♂. Hubei(IZCAS): Shennongjia, Dajiuhu, 1800m, 1.VIII.1981, coll. Han Yinheng, 1♂; Xingshan, Longmenhe, 1350 m, 14-16.VII.1993, coll. Song Shimei, 4♂. Sichuan(IZCAS): Wenchuan, Wolong, 1920 m, 22.VII.1983, coll. Wang Shuyong, 1♂. A few males from Shaanxi and Sichuan in coll. ZFMK.

Distribution.

China (Henan, Shaanxi, Gansu, Hubei, Sichuan).