Gargela bilineata Song, Chen & Wu, 2009, sp. nov.

Gargela bilineata sp. nov.

Figs. 3, 15, 26

External characters. Wing span 13mm. Head and thorax silvery white; labial palpi upturned; antennae tinged with orange-brown; frons white. Abdomen yellowish, dorsal slightly tinged with brown. Forewing silvery white; medial line fuscous, arising from middle of costa to discocellulares, then bent to inner margin; a dark fuscous spot at the lower angle of cell; submarginal with two lines, the inner line fuscous, from costa to vein M1 then bent inwards to anal angle, the outer line yellow, adjacent to and paralleled with the inner line; marginal area suffused with orange-yellow longitudinal fasciae along the veins and a black spot between M3 and Cu1; a fine black marginal line from apex to middle of outer margin; cilia silvery white, with golden luster. Hindwing white; cilia white, male with a tuft of yellow-brown cilia at anal angle.

Male genitalia. Uncus strong, the apex pointed, ventral with a tuft of thick setae; gnathos tapering pointed, slightly curved to dorsal; tegumen simple, elongate, with a tuft of setae dorsally; valva with basal broad and apical contracted, costal arm much longer than valva, but not apart from valva, the apex pointed, sacculus strongly sclerotized, rounded; juxta long oval-like, with two small papillate processes at apex; aedeagus with a row of spine-like cornuti, the length about half of the aedeagus.

Female genitalia. Anal papillae weakly fused, with dense setae; apophysis posterioris about 1/2 the length of apophysis anterioris; ostium bursae tube-like, slightly sclerotized; ductus bursae long, swollen and little sclerotized at middle; corpus bursae rounded, with two spine-like signa.

Holotype. IZCAS: 3, Sichuan, Mt. Emei (29.5ºN, 103.3ºE), 1800–1900m, 1979. VI.17, leg. Bai Jiuwei (genital slide number C1079).

Paratypes. IZCAS: 1Ƥ, Zhejiang, Mt. Mogan (30.6ºN, 119.8ºE), 1981. IX.11, Song Shimei (genital slide number C1673); 13, Hunan, Cili (29.4ºN, 111.1ºE), 1988. IX.4, Song Shimei (C1664); 1Ƥ, Fujian, Mt. Wuyi, Sangang (26.4ºN, 116.4ºE), 740m, 1980. X.3, Jiang Fan (C1670); 131Ƥ, Guangxi, Longsheng (25.7ºN, 110.0ºE), 300m, 1980. VI.12, Song Shimei (C1687, C1688); 333Ƥ, Sichuan, Mt. Qingcheng (30.9ºN, 103.5ºE), 1980. VII.11–28, Bai Jiuwei (C1368, C1078); 133Ƥ, Sichuan, Mt. Emei (29.5ºN, 103.3ºE), 1800–1900m, 1979. VIII.20, Gao Ping (C1367); 23, Guizhou, Mt. Leigong (26.4ºN, 108.2ºE), 740–950m, 2005. VI.1, Chen Fuqiang (C1602, 1689); 1Ƥ, Guizhou, Chishui, Jinshagou (28.5ºN, 105.7ºE), 200m, 2000. VI.2, Wu Chunsheng; 13, Guizhou, Chishui, Sanchahe (28.5ºN, 105.7ºE), 300–500m, 2000. V.28, Wu Chunsheng.

Distribution. China (Zhejiang, Hunan, Fujian, Guangxi, Sichuan, Guizhou).

Remarks. This species is similar to G. renatusalis, but can be distinguished by following characters: in external characters, forewing of this species has a fuscous spot at the lower angle of cell and the terminal of medial line is not expanding into a patch, while forewing of G. renatusalis does not have the spot at the lower angle of cell and the terminal of medial line is expanding into a patch; in male genitalia, this species with a row of spine-like cornuti in aedeagus while G. re n a t u s a l i s only with a long spine-like cornutus.

Etymology. The name is derived from the Latin “ bi ” and “ linea ”, corresponding to the two submarginal lines on forewing.