Sarcohyla pentheter, the mourning treefrog,^[1] is a species of frog in the family Hylidae. It is endemic to Mexico. Its natural habitats are subtropical or tropical moist montane forests and rivers. Scientists have observed it pine-oak forests on the west side of the Sierra Madre del Sur mountains in Oaxaca between 1,280 and 2,000 meters above sea level.^[2][3]

This frog lays eggs in streams.^[1]

It is threatened by habitat loss associated with small farms (including partially shaded coffee farms), small grazing spaces, and mining. It is also vulnerable to the fungal disease chytridiomycosis.^[1]