Tylostega lata 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 : 58-60

publication ID	https://doi.org/ 10.5281/zenodo.180403
DOI	https://doi.org/10.5281/zenodo.6230928
persistent identifier	https://treatment.plazi.org/id/CC169D2B-FF8A-FFF9-79F5-A51CFED9FE7A
treatment provided by	Plazi
scientific name	Tylostega lata Du & Li
status	sp. nov.

Treatment

Tylostega lata Du & Li , sp. nov.

( Figs. 4 View FIGURES 1 – 5 , 11 View FIGURES 8 – 12 , 16 View FIGURES 13 – 17 , 21 View FIGURES 18 – 21 )

Type specimens. Holotype ɗ, CHINA: [label 1] “Médog County (29°13' N, 95°18' E), Xizang (Tibet) Autonomous Region / 880 m elev. / 16. VIII. 2003 / leg. Xinpu Wang & Huaijun Xue”; [label 2] “genitalia slide ɗ / DXC07043”; [label 3, red] “ Holotype ɗ / Tylostega / lata / Du et Li”. Paratypes: 1 ɗ, 1 Ψ, other same data as holotype.

Diagnosis. This species is very similar to T. luniformis sp. nov. in appearance, but can be separated by the dorsal margin of the sacculus inflated triangularly at basal 2/3; the juxta with a strong fingerlike process posterolaterally; the phallus with a protrusion distally and with two spinelike cornuti and one broadly boardlike cornutus bearing weak teeth. In T. luniformis sp. nov., the dorsal margin of the sacculus is not inflated triangularly at basal 2/3; the juxta has a strong hornlike process mediolaterally; the phallus has two spinelike and one luniform cornuti, and bears no protrusion distally.

Description. Adult ( Fig. 4 View FIGURES 1 – 5 ). Wing span 19.0–21.0 mm. Frons yellowishwhite except fuscous anteriorly. Antenna with ventral cilia about 1.5 times length flagellomere diameter in male, and about as long as in female. Labial palpus yellowishwhite, 2nd segment brown or fuscous dorsally and distally, 3rd segment diffused with a few brown scales laterally. Thorax yellowishwhite dorsally, each segment with a fuscous blotch. Patagium and tegula yellowishwhite, diffused with brown. Forewing pale yellow diffused with brown, with fuscous patches at base, discoidal stigma and lines blackishfuscous; lines forming blackishfuscous spots on costa; postmedial line sinuated as in T. pectinata , distinct on costa only; a series of blackishfuscous spots along terminal margin. Hindwing yellowishwhite, with large fuscous patch at base, suffused with brown in distal half; discoidal stigma dark fuscous, claviform; terminal margin with some inconspicuous fuscous spots. Cilia of both fore and hindwings light brownishyellow, paler distally. Abdomen with 1st segment white with fuscous transverse patches, 2nd–5th segments blackishfuscous, 6th–8th segments pale yellow dorsaly; ventral surface yellowishwhite, diffused with brown.

Male genitalia ( Figs. 11 View FIGURES 8 – 12 , 16 View FIGURES 13 – 17 ). Uncus with height greater than basal width. Valva narrower, its dorsal and ventral margins nearly parallel; with large, median, irregular quadrangular projection bearing small dense spines anteriorly. Sacculus inflated triangularly at basal 2/3 on dorsal margin, narrowed at subapex; distal part inflated triangularly, with small flat process. Saccus oval. Juxta circular, with strong fingerlike process posterolaterally. Phallus with protrusion distally, with two spinelike cornuti and one broad, boardlike cornutus with weak teeth.

Female genitalia ( Fig. 21 View FIGURES 18 – 21 ). Apophysis anterioris about 1.5 times length of apophysis posterioris. Ductus bursae wide, contorted, more thickly sclerotized than middle portin of corpus bursae. Corpus bursae narrowly elongate, appreciably broader than ductus bursae, 3 times as long as ductus bursae, and slightly broadened anteriorly.

Distribution. China (Tibet).

Etymology. The specific name is derived from the Latin latus = broad, in reference to the broad, boardlike cornutus.