Tylostega pectinata Du & Li

Du, Xicui & Li, Houhun, 2008, A review of Tylostega Meyrick from Mainland China (Lepidoptera, Crambidae, Spilomelinae), with descriptions of four new species, Zootaxa 1681, pp. 51-61 : 53-55

Tylostega pectinata Du & Li , sp. nov.

( Figs. 2 , 9 , 14 , 19 )

Type specimens. Holotype ɗ, CHINA: [label 1] “Li Shan (35°25' N, 111°58' E), Shanxi Province / 1520 m elev. / 19. VIII. 2006 / leg. Xu Zhang & Haiyan Bai”; [label 2] “genitalia slide ɗ / DXC06352”; [label 3, red] “ Holotype ɗ / Tylostega / pectinata / Du et Li”. Paratypes: 7 ɗ, 5 Ψ, Wufeng Tujiazu Autonomous County (30°12' N, 116°40' E), Hubei Province, 1100 m, 10–12. VII. 1999, leg. Houhun Li et al.; 1 ɗ, 4 Ψ, Hefeng County (29°53' N, 110°02' E), Hubei Province, 1260 m, 15–17. VII. 1999, leg. Houhun Li et al.; 4 ɗ, 1 Ψ, Xianfeng County (29°40' N, 109°08' E), Hubei Province, 1280 m, 21–22. VII. 1999, leg. Houhun Li et al.; 4 ɗ, Xishui County (28°19' N, 106°12' E), Guizhou Province, 500 m, 31. V. 2000 –3. VI, 1200 m, 1. VI. 2001, leg. Yanli Du; 2 ɗ, Chishui (28°34' N, 105°42' E), Guizhou Province, 390 m, 28, 30. V. 2000, leg. Yanli Du; 1 Ψ, Chishui (28°34' N, 105°42' E), Guizhou Province, 240 m, 22. IX. 2000, Haili Yu; 1 Ψ, Xishui County (28°19' N, 106°12' E), Guizhou Province, 28. IX. 2000, leg. Haili Yu; 1 Ψ, 6 ɗ, Daozhen Autonomous County (28°53' N, 107°36' E), Guizhou Province, 600–1370 m, 18–25. VIII. 2004, leg. Yunli Xiao; 1 ɗ, Wen County (32°58' N, 104°41' E), Gansu Province, 2000 m, 5. VII. 2001, leg. Houhun Li & Xinpu Wang; 4 ɗ, 1 Ψ, Tianshui (34°37' N, 105°42' E), Gansu Province, 1331 m, 28–30. VII. 2006, leg. Xinpu Wang & Xiangfeng Shi; 1 Ψ, Weishan Yizu Huizu Autonomous County (25°14' N, 100°18' E), Yunnan Province, 2200 m, 21. VII. 2001, leg. Houhun Li & Xinpu Wang; 1 ɗ, 2 Ψ, Fangchenggang (21°37' N, 108°20' E), Guangxi Zhuangzu Autonomous Region, 640 m, 8. IV. 2002, leg. Shulian Hao & Huaijun Xue; 1 ɗ, 1 Ψ, Daiyun Shan (25°47' N, 118°15' E), Fujian Province, 850 m, 15. IX. 2002, leg. Xinpu Wang; 2 ɗ, Wuyi Shan (26°54' N, 116°42' E), Fujian Province, 1100 m, 22. V. 2004, 600 m, 27. V. 2004, leg. Haili Yu; 1 ɗ, Huangshan (29°43' N, 118°18' E), Anhui Province, 6. VIII. 2004, leg. Jiasheng Xu & Jialiang Zhang; 5 ɗ, 2 Ψ, Yiyang County (34°31' N, 112°10' E), Henan Province, 1000 m, 28–30. VII. 2006, leg. Denghui Kuang & Hui Zhen.

Diagnosis. This species is similar to T. tylostegalis (Hampson) superficially, but can be distinguished by the valva with a large quadrate projection medially, the dorsal margin of the sacculus smooth and concave at basal 1/3, the juxta with a strong finger­like process posterolaterally, and the phallus with two spinelike and one pectinate cornuti in the male genitalia. In T. tylostegalis the valva has a small triangular projection at middle, the dorsal margin of the sacculus bears small teeth and is not concave at basal 1/3, the juxta has no strong finger­like process, and the phallus has three spine­like cornuti.

Description. Adult ( Fig. 2 ). Wing span 18.0–21.0 mm. Frons yellowish­white or pale yellow except fuscous anteriorly. Antenna with ventral cilia about as long as diameter of flagellomeres in male, minute in female. Labial palpus white or yellowish­white, 2nd segment brown or fuscous dorsally and distally, 3rd segment yellowish­white or pale yellow. Patagium yellowish­white, with some brown scales. Thorax yellowishwhite or pale yellow dorsally, each segment with a fuscous blotch. Tegula yellowish­white or pale yellow, diffused with brown. Forewing pale yellow mixed with brown, with fuscous or black patches at base; discoidal stigma and lines blackish­fuscous; lines broader and darker on costa; antemedial line slightly excurved; postmedial line sinuous to CuA2, acutely retracted to lower cell, then to inner margin; a series of blackish­fuscous spots along terminal margin. Hindwing yellowish­white, with fuscous patch at base; discoidal stigma dark fuscous, reniform; a broad region consisting of brown patches extending from middle of inner margin obliquely to costal and terminal margins; terminal margin with some dark fuscous spots. Cilia of both fore­ and hindwings pale yellow or light brownish­yellow, slightly darker at base. Abdomen with 1st segment white with two fuscous patches, the remainder pale yellow and suffused with fuscous on 2nd–5th segments dorsally; ventral surface white or yellowish­white.

Male genitalia ( Figs. 9 , 14 ). Uncus about as high or higher than basal width. Valva slightly narrowed distally, medially with large and quadrate projection bearing dense small spines anteriorly. Sacculus concave at basal 1/3 on dorsal margin, arched in middle, sometimes slightly inflated triangularly at basal 2/3; distal part gradually narrowed, forming hook with two small flat processes. Saccus oval or triangular, bluntly rounded on anteriorly margin. Juxta rounded anteriorly, gradually broadened backwards, with strong fingerlike process posterolaterally. Phallus with two spine­like and one pectinate cornuti, one of the spine­like cornuti with two smaller spines medially in some specimens.

Female genitalia ( Fig. 19 ). Apophysis anterioris about 1.5 times length of apophysis posterioris. Ductus bursae twisted; basal 1/3 more sclerotized and bearing strong thumb­like process near base; basal part before process about 2 times width of remainder part; distal 2/3 with broad transverse stripes consisting of small granules. Corpus bursae about as long as ductus bursae, broader anteriorly.

Distribution. China (Shanxi, Henan, Hubei, Anhui, Fujian, Guizhou, Yunnan, Gansu).

Etymology. The specific name is derived from the Latin pectinatus = pectinate, in reference to the pectinate cornutus.

Remarks. Slight differences can be found within this species. The uncus is about as high or higher than its basal width. In the male specimens collected from Anhui, Fujian, Guangxi and Guizhou, the dorsal margin of the sacculus is slightly inflated triangularly at basal 2/3, the saccus is triangular with the anterior margin bluntly rounded, and the spine­like cornuti has no spines medially. While in the male specimens collected from Shanxi, Henan, Hubei, Yunnan and Gansu, the dorsal margin of the sacculus is not inflated triangularly at basal 2/3, the saccus is oval, and one of the spine­like cornuti has two smaller spines medially.

Figures

FIGURES 1 – 5. Adults of Tylostega spp. 1. T. tylostegalis (Hampson), ♂, Tongbai, Henan; 2. T. pectinata sp. nov., ♂, paratype, Daiyun Shan, Fujian; 3. T. luniformis sp. nov., ♂, holotype, Baoxing, Sichuan; 4. T. lata sp. nov., Ψ, paratype, Médog, Xizang (Tibet); 5. T. serrata sp. nov., ♂, paratype, Song County, Henan.

FIGURES 8 – 12. Male genitalia of Tylostega spp. 8. T. tylostegalis (Hampson), slide DXC 05121; 9 a. T. pectinata sp. nov., slide DXC 06352; 9 b. T. pectinata sp. nov., slide DXC 06597; 10. T. luniformis sp. nov., slide DXC 06348; 11. T. lata sp. nov., slide DXC 07043; 12. T. serrata sp. nov., slide DXC 05140.

FIGURES 13 – 17. Cornuti of Tylostega spp. 13. T. tylostegalis (Hampson), slide DXC 05121; 14 a. T. pectinata sp. nov., slide DXC 06352; 14 b. T. pectinata sp. nov., slide DXC 06597; 15. T. luniformis sp. nov., slide DXC 06348; 16. T. lata sp. nov., slide DXC 07043; 17. T. serrata sp. nov., slide DXC 05140.

FIGURES 18 – 21. Female genitalia of Tylostega spp. 18. T. tylostegalis (Hampson), slide DXC 06351; 19. T. pectinata sp. nov., slide DXC 07044; 20. T. luniformis sp. nov., slide DXC 06349; 21. T. lata sp. nov., slide DXC 06404.