Elophila nymphaeata, the brown china mark, is a species of moth of the family Crambidae.

The moth is notable as its larva, like most members of the crambid subfamily Acentropinae, is aquatic and has tracheal gills.

[citation needed] The wingspan is 16–20 mm.The forewings vary from yellow-ochreous to rather dark fuscous; basal area with dentate white and dark fuscous lines; a white subcostal spot before first line; lines whitish, obscure, dark-margined, first angulated above middle, second with deep abrupt sinuation inwards below middle; median band almost occupied by three white dark edged blotches; an irregular interrupted white dark-edged and dark-veined subterminal streak.

Hindwings as forewings, but base white, median band white except discal spot, second lineless sinuate.The larva is light brownish; dorsal line darker; head light brown; plate of 2 black-edged.

In flat oval floating cases of leaf-fragments, on Potamogeton, Hydrocharis, Sparganium, etc[2] See also Parsons et al.[3] The moth flies from May to September depending on the location.