Isthmura boneti (until recently, Pseudoeurycea boneti; common name: Oaxacan false brook salamander) is a species of salamander in the family Plethodontidae. It is endemic to north-central Oaxaca, Mexico. Its natural habitats are pine and pine-oak forests at high elevations. It is terrestrial and found beneath logs and rocks. Formerly very abundant, the species has declined for unknown reasons; it has also declined in suitable habitat, so habitat loss is not a sufficient explanation.