Hyloxalus mystax

Hyloxalus mystax is a species of frog in the family Dendrobatidae. It is endemic to Ecuador where it is only known from its type locality on the Cordillera del Cóndor at 1830 m asl. It is a little known species not observed since 1972.

Description
Males measure 19.5 – and females 19.2 – in snout–vent length. They have scattered dark spots on the abdomen. Males have pronounced black stippling on the throat. The male call is a rapid series of chirps.

Habitat and conservation
The species' natural habitats are cool montane cloud forests. It was fairly common when the type series was collected in 1972; it has not been observed afterwards (there has not been sufficient search effort either ). Threats to this species are unknown.