Holotype ♂ – China, Guizhou Province: Chishui (28°34'N, 105°42'E), 390 m, 30.V.2000, coll. Yanli Du, genitalia slide no. YHL04481; Paratype – 1 ♂, 27.V.2000, other same data as for holotype, genitalia slide No. ZAH10019.

This species is similar to Fibuloides cyanopsis(Meyrick, 1912) in the shape of uncus and socius, but can be distinguished by the trapezioidal cucullus and the absence of the enlarged, flattened bristles on the neck of valva. In Fibuloides cyanopsis the cucullus is ovate and the neck of valva has two or more short enlarged, flattened bristles on its ventral side.

Adult (Fig. 1). Forewing length 6.5 mm. Head: Vertex with gray scales; frons white. Antenna light brown. Labial palpus slender, gray intermixed with brown, third segment porrect. Thorax: Thorax and tegula gray intermixed with light brown. Forewing elongate triangular, with ground color dark gray; basal patch extending from costal 1/4 to 1/3 of dorsum, protrudent in middle on outer side; median fascia short and broad, extending from costal half, terminated at end of cell; ocellus nearly quadrate, containing some short brown striae; apex brown, protrudent; termen slightly concave below apex, bordered by brown scales; costa with nine pairs of strigulae from base to apex, each pair of strigulae with a short brown stria extending obliquely; first to fourth pairs between base of wing and the point where Sc meets costa, broad brown patch lying between second and third pairs; fifth and sixth pairs between Sc and R1; distal three pairs distributed between pairs of veins R1–R2, R2–R3, R3–R4 respectively, separated from each other by dark brown scales; cilia gray mixed with brown. Hindwing and cilia gray. Legs gray, tarsi with brown rings.

Male genitalia (Fig. 10). Uncus bifurcated from near base, produced into two slender, parallel and widely separated tips. Socius broad and short, about twice as long as wide, drooping, hairy, with round end. Valva broad at base; neck distinct, without enlarged, flattened bristles; sacculus about twice size of cucullus, with a line of flattened long bristles; cucullus trapezoidal, hairy, with marginal spines. Anellus closely surrounding basal 1/3 of aedeagus; aedeagus long tubular, cornuti consisting of a bunch of curved spines.

Unknown.

China (Guizhou).

The specific name is derived from Latin trapezoideus (= trapeziform), referring to the shape of the cucullus.

China, Sichuan Province: 1 ♀, Baoxing County, 1600 m, 3.VIII.2004, coll. Yingdang Ren. Zhejiang Province: 2 ♂♂, 3 ♀♀, Mt. Tianmu, 350–1500 m, 18~20.VIII.1999, coll. Houhun Li et al. Hubei Province: 2 ♂♂, 3 ♀♀, Hefeng County, 1260 m, 15–16.VII.1999, coll. Houhun Li et al. Henan Province: 1 ♀, Song County, 1580 m, 23.VII.2002, coll. Xinpu Wang.

Fagaceae: Castanea mollissima Blume and Castanea cranata Sieb. et Zucc. (Kuzenetsov 2001; Liu and Li 2002).

China (Anhui, Henan, Hubei, Guangxi, Liaoning, Sichuan, Yunnan, Zhejiang), Korea, Japan, India, Bengal.

The number of thick flattened bristles below the neck of the valva in the male genitalia is variable (two or more).

China, Yunnan Province: 1 ♂, Yuanjiang County, 710 m, 28.IV.1995, coll. Guangyun Yan.

Sapindaceae: Litchi chinensis Sonn. (Kuznetsov 2001).

China (Yunnan, Taiwan); Sri Lanka; India.

The male uncus is produced into two sharp, outwardly bent tips, and the cucullus is nearly elliptic, ending in a spine, with a ventral process bearing a short distal spine.

Diakonoff (1950) designated the male lectotype and Clarke (1958) provided photographs of the adult and male genitalia. Horak (2006) transferred Acroclita corinthia and Acroclita nigrovenana to Fibuloides. We synonymize Fibuloides nigrovenana with corinthia based on the the study of the adult and the male genitalia. Though we were unable to locate the type of Fibuloides corintha in BMNH, the two species appear to be conspecific based on a comparison of the photo in Clarke (1958) and the illustration in Rose and Pooni (2005)of Acroclita corinthia with the photo of Acroclita nigrovenana from Japan in Nasu (1993) as well as with the adult and male genitalia of the Chinese specimen.

China, Guangxi Zhuangzu Autonomous Region: 1♂, 3 ♀♀, Shangsi County, 260–770 m, 1–3.IV.2002, coll. Shulian Hao and Huaijun Xue; 1 ♂, 3 ♀♀, Mt. Maoer, 550–1100 m, 19–20.IV.2002, coll. Shulian Hao and Huaijun Xue. Guangdong Province: 1 ♀, Lianzhou, 650 m, 23.VI.2004, coll. Dandan Zhang. Guizhou Province: 1 ♀, Jiangkou County, 1700 m, 29.VII.2001, coll. Houhun Li and Xinpu Wang.

China (Guangdong, Guangxi, Guizhou), Japan, Vietnam, Indonesia, India.

The cucullus of this species is ovate, and the neck of valva has two or three short enlarged, flattened bristles.

Holotype ♂, China, Yunnan Province: Weishan County, 2200 m, 20.VII.2001, coll. Houhun Li and Xinpu Wang, genitalia slide no. ZAH03725.

China (Yunnan).

This species can be easily distinguished from its congeners by the drooping uncus with a blunt apex, and the narrow valva with the neck bearing five long, flattened flagellate bristles on the left side and four on the right side.

China, Shaanxi Province: 2♂♂, Ningshan County, 880 m, 17.VI.1987, coll. Houhun Li; 9 ♂♂, 3 ♀♀, Yangxian County, 600–680 m, 17–18.IV.1995, coll. Hongjian Wang. Henan Province: 3 ♂♂, Luoshan County, 350 m, 2.V.2000, coll. Haili Yu; 2 ♂♂, Xinyang City, 700 m, 11.VII.1997, coll. Houhun Li; 1♂, Tongbai County, 300 m, 11.IX.2001, coll. Houhun Li and Ole Karsholt; 2 ♂♂, Chishui County, Guizhou Province, 240 m, 21–22.IX.2000, coll. Haili Yu. Guizhou Province: 1 ♂, Xishui County, 500 m, 25.IX.2000, coll. Haili Yu; 5 ♂♂, 1 ♀, Daozhen County, 1300 m, 20.VIII.2004, coll. Yunli Xiao. Zhejiang Province: 1 ♂, Mt. Tianmu, 650 m, 20.VIII.1999, coll. Houhun Li. Hunan Province: 1 ♀, Zhangjiajie, 650 m, 7.VIII.2001, coll. Houhun Li and Xinpu Wang. Fujian Province: 1 ♂, Nanping, 850 m, 23.IX.2002, coll. Xinpu Wang; 1 ♂, Jianning County, 350 m, 25.IX.2002, coll. Xinpu Wang. Hubei Province: 1 ♂, Hefeng County, 1260 m, 16.VII.1999, coll. Houhun Li.

China (Zhejiang, Anhui, Fujian, Henan, Hubei, Hunan, Sichuan, Guizhou, Shaanxi, Taiwan), Korea, Japan.

This species is distinguished by the digitate process on the sacculus in the male genitalia bearing either dense tufted bristles or five enlarged, flattened bristles distally.

In the examined specimens, the appearance of the adults and the female geniatlia are identical, but the male genitalia have two types (Figs 15a and 15b): in figure 15a, the relatively elongate uncus looks like a pair of long ears of a rabbit, and the slender digitate process of the sacculus bears five enlarged, flattened bristles distally; in figure 15b, the short uncus is emarginated posteriorly and somewhat heart-shaped, and the digitate process of the sacculus is relatively broad and bears dense tufted bristles distally. The two types of male genitlia might represent two different species, but in this paper we treat these differences as individual variations. We may confirm whether they are two species or just one species after a geographic analysis, which can be done when more specimens are available.

China, Zhejiang Province: 1 ♂, Mt. Tianmu, 350 m, 20.VIII.1999, coll. Houhun Li et al. Fujian Province: 1 ♂, Yongtai County, 550 m, 18.IX.2002, coll. Xinpu Wang.

China (Zhejiang, Fujian), Vietnam.

This species can be easily distinguished by its Y-shaped uncus and the slender distally attenuate cucullus. It is new for China.

China, Guangxi Zhuangzu Autonomous Region: 1 ♂, Leye County, 665 m, 24.VII.2004, coll. Jiasheng Xu.

China (Guangxi), Vietnam.

The uncus of this species is broad and distally bifurcate, the valva has a long, sinuate, flattened bristle on the neck, and the cucullus is elongatesubrectangular and distally downcurved. In figure 17 the long flattened bristle is off the inserted hole which is located on the ventral side of the neck instead of on the angle of the sacculus (see arrow in fig. 17).It is new for China.

Holotype ♂, China, Fujian Province: Mt. Wuyi, 1000 m, 26.V.2004, coll. Haili Yu, genitalia slide no. ZAH04215; Paratype: 1 ♂, same data as for holotype.

China (Fujian).

This species is distinguishable from its congeners by the following characters: the uncus tips are slender and closely parallel; the socius is laterally triangular; and the neck of the valva has a short flattened bristle.