Tagiades gana, commonly known as the Immaculate/Large/Suffused Snow Flat, is a butterfly

Butterfly

A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured...

 belonging to the family Hesperiidae.

Description

See glossary

Glossary of Lepidopteran terms

This glossary describes the terms used in the formal descriptions of insect species, jargon used mostly by professionals or entomologist....

 for terms used.

Watson (1891) gives a detailed description as follows :-
Male and female have a dark brown ground colour. The male has on the upperside of the forewing, three minute semi-transparent spots obliquely before the apex ; a transverse discal series of streaks, a small patch within the cell, one near the base of the wing, and exterior margin blackish ; hindwing with the lower third pure white which is straightly separated from the brown of the basal portion ; apical margin and three spots on the upper part of the disc, black, and two spots on the middle of the
white anterior margin. Underside paler brown, semi-transparent spots on forewing as above : hindwing white suffused with brown along the anterior margin : upper discal and marginal spots as above black.
Female paler. Upperside somewhat greyish-brown ; forewing with spots and blackish discal streaks, and hindwing with upper discal spots as in male : exterior margin of hindwing greyish-white. Underside as in male. Cilia of both sexes pure white on the lower portion of the hindwing, the rest brown.

Dioscorea alata is a host plant for the larvae.