Bivincula watsoni

Bivincula watsoni Dierl, 1978, Spixiana, 1 (3): 260, pl. V, fig. 37, text-fig. 23. TL: Sikkim.
Wang, X., Wang, M., Zolotuhin, V.V., Hirowatari, T., Wu, S. and Huang, G.H., 2015. The fauna of the family Bombycidae sensu lato (Insecta, Lepidoptera, Bombycoidea) from Mainland China, Taiwan and Hainan Islands The fauna of the family Bombycidae sensu lato (Insecta, Lepidoptera, Bombycoidea) from Mainland China, Taiwan and Hainan Islands. Zootaxa, 3989(1), pp.1-138. Fig. 16F.
Identified by Ian Kitching after examining museum collection. Similar species: Bivincula diaphana (Moore, 1879)
 and Bivincula kalikotei (Dierl, 1978). See next observation.