Nine recently metamorphosed young were found on vegetation at the edges of streams in April. These specimens have snout-vent lengths of 13.1 to 15.7 mm. (14.9 mm.) and in life were pale greenish tan or olive-tan above and white below. The hands, feet, and thighs were pale yellowish tan. _Remarks._--The foregoing synonymies indicate that confusion has existed in the application of various names, to this species, as well as in use of the names _sordida_ and _gabbi_ to include the species that we describe and name _Smilisca sila_. Correct allocation of the names involved was possible only after studying and comparing the type specimens, for the descriptions given by the various authors are not sufficiently explicit to determine the nature of many essential features. The presence of a rounded snout and a long white throat in males distinguishes _S. sordida_ from _S. sila_, which has a high truncate snout and short dark throat in males. The two syntypes of _Hyla sordida_ Peters, 1863, (ZMB 3141) are males having snout-vent lengths of 36.9 and 37.0 mm. The two syntypes of _Hyla gabbi_ Cope, 1876 (USNM 30658-9), are females having snout-vent lengths of 52.8 and 53.7 mm., respectively. Also included in the collections made by Gabb is eastern Costa Rica are two males (USNM 30685-6), which Cope (1876) named and described as _Hyla nigripes_. These specimens are soft and faded, but are recognizable as the same as _Hyla sordida_ Peters; the syntypes of _Hyla nigripes_ have snout-vent lengths of 37.6 and 37.7 mm. We have examined one of the syntypes of _Hyla salvini_ Boulenger, 1882 (BMNH 1947.2.24.13), a female having a snout-vent length of 54.6 mm. We are convinced that all of these type specimens are representatives of one species, the earliest name for which is _Hyla sordida_ Peters, 1863. The type localities for three of the named species are in Costa Rica--_H. gabbi_ from Sipurio on the Caribbean lowlands, _H. nigripes_ from the Caribbean slopes of Pico Blanco, and _H. salvini_ from Cartago on the Meseta Central. The type locality of _H. sordida_ was given as "Veraguas" by Peters (1863). At that time Veraguas was often considered to be most of western Panama. Though we have not seen Panamanian specimens other than the types of _S. sordida_ and one specimen from the Pacific lowlands of western Panama, the species probably occurs on the Caribbean slopes of western Panama. The species has been taken on the Caribbean lowlands of Costa Rica within a few kilometers of Panama; collecting on the Caribbean slopes in the provinces of Bocas del Toro and Veraguas should reveal the presence of _Smilisca sordida_ there.