Xenochalepus rufithorax is a species of beetle of the family Chrysomelidae. It is found in Costa Rica, El Salvador, Mexico (Guerrero, Veracruz) and Nicaragua.
It is very similar to Xenochalepus erythroderus, but the clypeus is rather larger, less distinctly pentangular, and the oblique apical foveae are much smaller and narrower, the sides of the thorax are slightly distinctly trisinuate. The elytra are entirely black, and their apical teeth are rather finer.
The food plant is unknown.