_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); 1 mi. NW Oho-ri, 13 (KU), 3 (UMMZ); Sangbonch´on-ni, 2 (UMMZ); 5 mi. ESE Seoul, 8 (KU); 6 mi. E Seoul, 10 (KU), 3 (UMMZ); 7 mi. NNE Sogwi-ri, Cheju Do, 1 (UMMZ). _Remarks._--Hylids from 5 mi. ESE Seoul were collected from a cement-walled pit at the Seoul City Water Works; a specimen of _Elaphe rufodorsata_ taken in the pit had eaten one hylid. Two individuals were taken in the morning of May 29 on leaf litter in a wooded valley in the Central National Forest where a number were calling in a light rain, but the species was rarely found in woods. Two frogs were found along a rocky stream at Sangbonch´on-ni. Most individuals were taken while calling, on grasses and reeds or on the ground, along the edges of rice fields. Sixteen hylids collected 1 mi. NW Oho-ri were calling in shallow water of a rice field on a hillside, but none was heard in a large lake nearby or in adjacent fields. On May 15, 4 mi. ESE Ch´orwon, approximately one hundred tadpoles, thought to be of this species, congregated near a drain (into a lower field) of an unused rice field; the tadpoles were well-developed, some having hind legs. The earliest and latest dates of collection represented in our material are May 8 and October 29. The call is best described as a raspy "waak," "week," or "wiick" in the middle register. The listing of "Hylae arboreae var japonicae descript pars _Schleg. in Fauna Japon._ p. 112 ..." by Günther (1858:81) in synonymy under the account of _Polypedates schlegelii_, implies that Schlegel was the first author to use the name-combination _Hyla arborea japonica_. Boulenger (1882:86, 381) went so far as to credit Schlegel as the author of the name _japonica_. The reason for this action is not known because Schlegel (in von Siebold, 1838:112) referred to this hylid only under the name "Hyla arborea." =Rana rugosa= Schlegel _Rana rugosa_ Schlegel, Reptilia [Saurii et Batrachii], _in_ von Siebold, Fauna Japonica, p. 110, pl. 3, figs. 3-4, 1838 (type locality designated as Japan, probably near Nagasaki, by Stejneger, Bull. U. S. Nat. Mus., 58:123, July 22, 1907). _Specimens examined_ (26).--Central National Forest, near Pup´yong-ni, 13 (KU), 1 (UMMZ); 2 mi. S Ch´orwon, 4 (KU); 2 mi. E Hoengsong, 3 (KU); 1 mi. NW Oho-ri, 1 (KU); 5 mi. ESE Seoul, 1 (KU); 6 mi. E Seoul, 3 (UMMZ).