Notocrypta curvifascia, the restricted demon,[1] is a butterfly belonging to the family Hesperiidae.

N. curvifascia is commonly found in many regions of temperate and tropical East Asia, Indonesia, and the Indian subcontinent.

[1][2] Among butterflies, it is relatively small, at approximately 4 cm long (adult).

Its wings are dark brown to black, with a white eyespot near the trailing end.

The larval host plants include members of the Zingiberaceae and Musaceae families such as Alpinia japonica, Alpinia zerumbet, Curcuma decipiens, Costus speciosus,[3] Curcuma longa, Globba marantina, Musa acuminata × balbisiana, Zingiber casumunar, Zingiber odoriferum, Zingiber officinale.