Kaloula borealis (Barbour)
Cacopoides borealis Barbour, Bull. Mus. Comp. Zool., 51(12):231, April, 1908 (type locality, Antung, Manchuria).
Kaloula borealis, Noble, Amer. Mus. Novit., 165:6, April 16, 1925.
Specimens examined (8).—5 mi. ESE Seoul, 1 (KU); 6 mi. E Seoul, 3 (UMMZ); 7 mi. ESE Seoul, 4 (KU).
Remarks.—On April 5, one male and three females were uncovered by a bulldozer from between one and two feet below the surface of the ground in an old Korean burial mound; one individual was completely surrounded by compact soil. All quickly became active when placed in water. Two of the females (43 and 44 in snout-vent length) contained masses of immature eggs. A male obtained on June 4 was found during a rain; the three UMMZ specimens were obtained on July 8 on banks above the Han River. Breeding of this species seems to coincide with the rainy season in late spring and early summer when males were noted calling around flooded ditches and swales in deep grass. The local Korean name of the species, which sounds something like "maeng-kongi," is said to come from the call, which is best described as a monotonous, snoring sound that rarely is heard in two parts as suggested by the name.
Hyla arborea japonica Günther
[Hyla arborea] Var. japonica Günther, Catalogue of the Batrachia Salientia in the ... British Museum, p. 109, 1858 (type locality, Japan).
Hyla arborea var. savignyi Boulenger, Ann. Mag. Nat. Hist., ser. 5, 19:67, January, 1887 (type locality, Gensan [= Wonsan], Korea).
Hyla stepheni Boulenger, Proc. Zool. Soc. London, p. 579, pl. 51, fig. 1 (for 1887), April, 1888 (type locality, Port Hamilton, a small island between Korea and Japan).
Specimens examined (44).—Central National Forest, near Pup´yong-ni, 2 (KU); 3 mi. NW Chip´o-ri, 1 (KU); 1 mi. N Mosulp´o, Cheju Do, 1 (KU);