Isodemis illiberalis (Meyrick, 1918)

Sun, Yinghui & Li, Houhun, 2011, Review of the genus Isodemis Diakonoff (Lepidoptera, Tortricidae) from China, with description of three new species, ZooKeys 77, pp. 51-64 : 53

Isodemis illiberalis (Meyrick, 1918) Figs 111-12

Tortrix illiberalis Meyrick 1918: 168. Type locality: India.

Cacoecia interjecta Meyrick 1922: 496. Type locality: India.

Syndemis montivola Diakonoff 1941: 40. Type locality: India.

Isodemis illiberalis ( Meyrick 1918): Diakonoff 1976: 113.

Material examined.

1 ♂, China, Guangxi Zhuang Autonomous Region: Milv Village, Nanping Town, Shangsi County (22°09'N, 107°58'E), 770 m, 3.IV.2002, coll. Shulian Hao and Huaijun Xue; 1 ♂, Mt. Pinglong, Shangsi County (22°09'N, 107°58'E), 510 m, 6.IV.2002, coll. Shulian Hao and Huaijun Xue; 1 ♂, Mt. Villa Huawang, Jinxiu Yao Autonomous County (24°08'N, 110°11'E), 550 m, 14.IV.2002, coll. Shulian Hao and Huaijun Xue; 8 ♂♂, Grand Canyon Laohutiao, Napo County (23°44'N, 106°48'E), 30.VII.2008, coll. Liusheng Chen and Guoyi Wu; 1 ♂, China, Yunnan Province: Tengchong County (25°01'N, 98°30'E), 1950 m, 28.IX.2002, coll. Huaijun Xue; 2 ♂♂, Xiaoheishan Nature Reserves (24°35'N, 98°41'E), 2300 m, 10.VIII.2005, coll. Yingdang Ren.

Diagnosis.

Adult (Fig. 1) with wingspan 16.0-19.5 mm. This species is characterized by the male genitalia with the uncus broadening from basal 1/3 to blunt apex, and the phallus having eight to twenty-three deciduous cornuti and a single non-deciduous cornutus (Figs 11-12); in the female genitalia by the sterigma deeply V-shaped, the ductus bursae about 1.5 times the corpus bursae, and the globular process almost 1/2 length of the signum ( Diakonoff 1941: 40, fig. 5). It can be easily distinguished from its congeners by the median fascia extending from below distal half of the costal fold to the dorsum and the subapical blotch reaching the tornus.

Distribution.

China (Guangdong, Guangxi, Yunnan), Vietnam, Thailand, India, Nepal.

Variation.

The uncus broadens from basal 1/3 to apex and the phallus has sixteen to twenty-three deciduous cornuti and a single non-deciduous cornutus in the specimens collected in Guangxi (Fig. 11); while the uncus is parallel sided and the phallus bears eight deciduous cornuti and a single non-deciduous cornutus in the specimens collected in Yunnan (Fig. 12).