Two new Choerophryne species from western Papua New Guinea (Amphibia: Anura: Microhylidae)

We describe two new species of the microhylid frog genus Choerophryne Van Kampen, 1914 from the mountains of Papua New Guinea. The first is a scansorial species known only from foothill forest at altitudes of 440–950 m a.s.l. on the northern slopes of Papua New Guinea’s Central Cordillera. It is a moderately large member of the genus (males 16.8–20.6 mm snout–urostyle length) that utters long series of short whistling calls each lasting 77–125 ms. The second species is arboreal and known only from a small area of montane forest at altitudes of 2060–2300 m a.s.l. on the southern edge of the Central Cordillera. It is also moderately large for the genus (three males with snout–urostyle lengths of 19.3–20.6 mm) and produces long series of short buzzing calls, each lasting 124–173 ms. Descriptions of these two species bring the number of recognised Choerophryne to 39, and at least 18 additional species in the genus await formal description.