Calletaera subexpressa (Walker, 1861)

Figs 39–41, 61, 78, 84, 96, 110

Acidalia subexpressa Walker, 1861, List Specimens lepid. Insects Colln Brit. Mus., 23: 773. Syntypes including 1 ♂, Borneo: Sarawak (OUM).

Macaria ruptaria Walker, 1861, List Specimens lepid. Insects Colln Brit. Mus., 23: 937. Syntypes including 1 ♂, Borneo: Sarawak (OUM).

Calletaera digrammata Wehrli, 1925, Mitt. münch. ent. Ges., 15 (1–5): 50, pl. 1, fig. 19. Syntypes 10 ♂, 14♀, China: Lienping (ZFMK). Syn. nov.

Calletaera angulata Warren, 1896, Novit. zool., 3: 139. Syntypes, India: Khasi Hills (BMNH).

Calletaera subexpressa: Holloway, 1976, Moths of Borneo with special reference to Mount Kinabalu: 78.

Diagnosis. The wing patterns of this species are similar to those of B. basipuncta as follows: the antemedial line of the forewing forms a distinct black patch on the costa; the discal spots of both wings are small black dot-like; the postmedial line of the forewing is narrow and discontinuous, but not dot-like; broad bands are present outside the postmedial lines of both wings; the postmedial line of the forewing forms two “<” shaped streaks near the anal margin; the submarginal lines of both wings are serrate. But B. subexpressa can be separated from B. basipuncta on the basis of the following characters: the wing colour is greyish white, but pale yellowish brown in B. basipuncta; the postmedial lines of both wings are black, but brown in B. subexpressa. The male genitalia of the species are distinctive as follows: the aedeagus has a small triangular process posteriorly; the vesica has three cornuti, a long and stout spine (about one-third length of the aedeagus), a rounded lobe with a short spine and a cluster of spines. The female genitalia of the species have some distinctive characters as follows: the lamella postvaginalis is very small and semicircular; the signum is large and rounded; the seventh sternite is weakly sclerotized posteriorly.

Material examined. CHINA: [Guangdong] (ZFMK): 1 ♂ (Syntype of Calletaera digrammata), Lienping, Juli. Fujian (IZCAS): 1♀, Chong’an, 22.X.1980, coll. Zhang Baolin; 4 ♂ 1♀, Wuyishan, Huangxizhou, 500 m, 29.VII.2006, coll. Xie Juan et al.; 2 ♂ 2♀, Wuyishan, Sangang, 704 m, 25–26.VII.2006, 11–14.VIII.2009, coll. Xue Dayong & Yang Chao. Guangdong (IZCAS): 5 ♂ 6♀, Shixing, Chebaling, 365–401 m, 22–26.VII.2008, coll. Chen Fuqiang. Hainan (IZCAS): 1 ♂, Bawangling, 145 m, 8.IV.2008, coll. Lang Songyun. Guangxi (IZCAS): 1 ♂, Jinxiu, Luoxiang, 200 m, 4.V.1999, coll. Han Hongxiang.

Distribution. China (Fujian, Guangdong, Hainan, Hong Kong, Guangxi), India, Nepal, Philippines, Peninsular Malaysia, Indonesia (Borneo).

Remarks. After examining the syntype of B. digrammata Wehrli, 1925 and a series of material collected near the type localities, we find that the external and genitalic features of C. digrammata are nearly identical to those of C. subexpressa. Therefore we sink B. digrammata as a junior synonym of C. subexpressa.