[3] It is endemic to northern Vietnam and know from two locations, its type locality Mau Son in the Lang Son Province,[2] and the Tay Yen Tu Nature Reserve in the Bac Giang Province.

[4] Males have enlarged forearms and black nuptial spines on prepollex, fingers I–III, and chest.

[2] In Tay Yen Tu the species was associated with streams at elevations of 300–500 m (980–1,640 ft) above sea level; the specimens were found sitting on stones.

[4] Both known populations occur in mountainous and relatively forested areas, and the upper elevational limit is estimated at 1,220 m (4,000 ft).

However, expanding human settlements, agriculture, and harvesting (though this species in particular has not been reported as being targeted) are likely threats.