A White Dragontail collecting nectar from some daisies at Cuc Phuong. Above, its wings are overall dull brownish black, with on the fore wings a hyaline triangular area....

...traversed with black veins, and over a white transverse band. This white transverse band extends to the hindwings, where it ends in a point.

Besides this, the hindwings also have a white tip and in the middle there  are a number of white dots.