Euthalia duda subsp. tsangpoi H. Huang 1999, stat. rev.

Euthalia duda tsangpoi H. Huang, 1999 stat. rev. Figs. 24–29, 39–44, 45 h-k, 56, 57, 60, 61 Euthalia tsangpoi H. Huang, 1999: 643, figs. 6, 7, 79; Yokochi 2012: 12, fig. 103. Material examined. Holotype: male, late July 1996, on road between Hanmi and Aniqiao, Motuo, SE Xizang (CQEC). Additional material examined: 2 males, altitude 2000 m, 4.VIII.2012, Bononggong, Motuo County, Xizang Autonomous Region, China, leg. Song-yun Lang, dissection No. NYM0017 & NYM0060 (CLSY); 1 female, 14. VIII. 2012, Suotong, Bomi County, Xizang Autonomous Region, China, leg. Song-yun Lang (CLSY); 1 male, 27. VI.2016, Yigong, Bomi County, Xizang Autonomous Region, China leg. Zhao-hui Pan, dissection No. STS-34888 (TAAHU). Discussion. Taxon tsangpoi was originally described as a bona species based on two males from Metok (Motuo) County, Southeast Xizang, China (H. Huang 1999). Later, H. Huang (2002) synonymized tsangpoi with E. duda (Figs. 15–23, 30–38, 45 a-g, 58, 59, 62–65), stating that both taxa cannot be separated soundly from each other. However, Yokochi (2012) resurrected the status of tsangpoi as a distinct species mainly based on the differences found in the male genitalia, e.g. the longer valva, broader uncus, shorter and undivided cornuti and more dents at the distal end of valva. To tackle the issue, we examined a series of specimens of both sexes of E. duda from various localities across its distribution including the lectotype, and several individuals of E. tsangpoi including the holotype. The examination of the male genitalia (Figs. 57–65) revealed that no constant difference can be found between both taxa, and the differences summarized by Yokochi (2012) shall be attributed to individual variation and the inaccuracy in the handdrawing (Fig. 56) of the male genitalia of the holotype illustrated in H. Huang (1999), compared with the image of the genitalia slide (Fig. 57). Although Yokochi (2012) stated that limited differences can be found in wing patterns between the type specimens of both taxa, after examining a long series of newly available material, we found that E. tsangpoi generally differs from E. duda by the basally narrower discal patch in space 3 on forewing upperside and the more obliquely placed patches in spaces 5 and 6 of forewing upperside in male (Fig. 45) and the broader discal band on hindwing in the female. Therefore, considering the evidences listed above, it is more reasonable to treat E. tsangpoi as a subspecies of E. duda, viz. E. duda tsangpoi stat. nov. Distribution. Southeast Xizang (Motuo and Bomi Counties), Southwest China.