- Common Name : Grass Demon
- Scientific Name : Udaspes folus (Cramer)
- Family : HESPERIIDAE
- Wingspan : 40-48mm
- Colour : Black with a big white spot on the hind wing and several smaller white spots on the fore wing. Male and female look similar.
- Habit : Bold butterfly and not easily disturbed. It avoids deep shade or stark sunlight. It is most abundant in the more open regions of hilly jungle. The Grass Demon is a nectar lover and has a long proboscis compared to body size.
- Larval Host Plants : Curcuma aromatica, Curcuma decipiens, Zingiber sp.
- Location : Throughout West Bengal