The Hind-wing butterfly has two unique tails. Both male and female have pale grey markings of the same colour and a distinctive black-edge on the underside of the wings. These markings are similar to an Orchid Tit pattern [Chliaria Othona]. There are no particular print markings below the costal vein at the anterior of the fore-wings. The male species have a pale-blue print above the costal vein on the forewing and the upper-side of the hind wings are broadly black bordered. The posterior area between the borders and the coral vein are violet in colour. The female species have a dark brown colour with black borders above the coral vein and a white discal posterior section. On both sexes the veins appear very dark on the upper-side of the hind wings. 
Beccaloni, G. W., Scoble, M. J., Robinson, G. S. & Pitkin, B. (Editors). 2003. The Global Lepidoptera Names Index (LepIndex). World Wide Web electronic publication. http://www.nhm.ac.uk/entomology/lepindex.
Evans, W.H. (1932) The Identification of Indian Butterflies. (2nd Ed), Bombay Natural History Society, Mumbai, India
Haribal, Meena (1992) Butterflies of Sikkim Himalaya and their Natural History. Sikkim Nature Conservation Foundation.
Savela, Marrku Website on Lepidoptera  (accessed 12 October 2007)
Wynter-Blyth, M.A. (1957) Butterflies of the Indian Region, Bombay Natural History Society, Mumbai, India.