Biston perclara (Warren, 1899)

Jiang, Nan, Xue, Dayong & Han, Hongxiang, 2011, A review of Biston Leach, 1815 (Lepidoptera, Geometridae, Ennominae) from China, with description of one new species, ZooKeys 139, pp. 45-96 : 69-70

Biston perclara (Warren, 1899) Fig. 54

Blepharoctenia perclara Warren, 1899, Novit. zool., 6: 49. Holotype ♂, China: Taiwan, Keelung. (BMNH)

Cusiala bengaliaria cerea Bastelberger, 1909, Dt. ent. Z. Iris, 22: 177. Holotype ♀, China: Taiwan. (Synonymized by Prout (1914))

Epamraica bilineata Matsumura, 1910, Thousand Insects Japan, (Suppl.) 2: 130, pl. 28, fig. 1. Syntypes ♀, Japan; China: Taiwan. (Synonymized by Prout (1914))

Biston perclara : Prout, 1914, Ent. Mitt., Berlin 3: 264.

Diagnosis.

The external characters of this species are similar to those of Biston thibetaria as follows: the forewing antemedial line and the postmedial lines of both wings are black and thick; black patches are present distally of the forewing postmedial line between M1 and M3, reaching the outer margin; another smaller black patch is present distally of the forewing postmedial line below M3. But in this species the broad bands placed basally of the antemedial line of the forewing and distally of the postmedial lines of both wings are pale yellow and indistinct, whereas they are yellowish green and distinct in Biston thibetaria ; the discal spots of both wings are less distinct or have completely vanished; the forewing postmedial line is straight between CuA2 and 1A + 2A, while it is slightly excurved in Biston thibetaria . The male genitalia of the species are almost identical to those of Biston thibetaria. But the median process of the gnathos of the species is truncate apically and the incision of posterior margin of the juxta is less deep.

Material examineds.

CHINA, Taiwan(ZFMK): Hueison Forest, Nantou, 570-800 m, 28-29.IX.1992, coll. F. Aulombard and J. Plante, 1♂. A large series from different localities of Taiwan in coll. ZFMK.

Distribution.

China (Taiwan), Japan.