Hylophorbus proekes

Adult males measure 27–35 mm (1.1–1.4 in) and adult females 33–37 mm (1.3–1.5 in) in snout–vent length. The snout is relatively long and pointed, especially in adults. The fingers and toes are unwebbed but bear discs with terminal grooves. Dorsal skin is pustulose. The dorsum is dark gray-brown or mud-brown, flecked or blotched with black. The fronts of the thighs and groin have conspicuous series of bright orange spots. The venter is gray with darker flecks. The iris is black, speckled with silver.^[1]

The male advertisement call is a rapid train of 5–7 pulsed, barking notes. The calls are delivered at intervals of 8–27 seconds and dominant frequency of about 1000 Hz.^[1]

Hylophorbus proekes is known from primary lowland and lower montane rainforests of Mount Sapau at elevations of 450–1,150 m (1,480–3,770 ft) above sea level. It was fairly common in the area. Males call while hidden under leaves, but sometimes also from exposed sites on the ground.^[1] As of late 2020, the conservation status of this species has not been assessed by the International Union for Conservation of Nature (IUCN).^[3]