Arthromastix is a genus of moths of the family Crambidae.

It contains only one species, Arthromastix lauralis, which is found in Central America (including Belize,[2] Costa Rica),[3] South America (including Brazil, Venezuela, Bolivia, Argentina), as well as the Dominican Republic and Cuba.

The forewings are yellowish white with a broad cupreous-brown border and a yellow marginal line.

[4] The larvae feed on Trichostigma octandrum.

This Asciodini-related article is a stub.