Newly metamorphosed young have snout-vent lengths of 12.0 to 15.5 mm. (average 13.4 in 23 specimens). The largest young are from La Libertad, El Peten, Guatemala; these have snout-vent lengths of 14.0 to 15.5 mm. (average 14.5 in five specimens). Young from 11 kilometers north of Vista Hermosa, Oaxaca, Mexico, are the smallest and have snout-vent lengths of 12.0 to 12.5 mm. (average 12.3 in three specimens). Recently metamorphosed young usually are dull olive green above and white below; brown transverse bands are visible on the hind limbs. The labial markings characteristic of the adults are represented only by a creamy white suborbital spot, which is a good diagnostic mark for young of this species. In life the iris is pale gold. _Remarks_: The considerable variation in color and the extensive geographic distribution of _Smilisca baudini_ have resulted in the proposal of eight specific names for the frogs that we consider to represent one species. Dumeril and Bibron (1841:564) proposed the name _Hyla baudini_ for a specimen (MNHN 4798) from Mexico. Smith and Taylor (1950:347) restricted the type locality to Cordoba, Veracruz, Mexico, an area where the species occurs in abundance. Baird (1854:61) named _Hyla vanvlieti_ from Brownsville, Texas, and (1859:35) labelled the figures of _Hyla vanvlieti_ [= _Hyla baudini_] on plate 38 as _Hyla vociferans_, a _nomen nudum_. Cope (1862:359) named _Hyla muricolor_ from Mirador, Veracruz, Mexico, and (1865:194) used the name _Smilisca daulinia_ for a skeleton that he employed as the basis for the cranial characters diagnostic of the genus _Smilisca_, as defined by him. Although we cannot be certain, Cope apparently inadvertently used _daulinia_ for _baudini_, just as he used _daudinii_ for _baudini_ (1871:205). Brocchi (1877:125) named _Hyla pansosana_ from Panzos, Alta Verapaz, Guatemala. [Illustration: PLATE 1 A B Dorsal views of skulls of young _Smilisca baudini_: (A) recently metamorphosed young (KU 60026), snout-vent length 12.6 mm. x23; (B) young (KU 85438), snout-vent length 32.1 mm. x9.] [Illustration: PLATE 2 A B Skull of adult female _Smilisca baudini_ (KU 68184): (A) Dorsal; (B) Ventral. x4.5.] [Illustration: PLATE 3 A B C Skull of adult female _Smilisca baudini_ (KU 68184): (A) Lateral; (B) Dorsal view of left mandible; (C) Posterior. x4.5.] [Illustration: PLATE 4 A B C D E F Palmar views of right hands of _Smilisca_: (A) _S. baudini_ (KU 87177); (B) _S. phaeota_ (KU 64276); (C) _S. cyanosticta_ (KU 87199); (D) _S. sordida_ (KU 91761); (E) _S. puma_ (KU 91716), and (F) _S. sila_ (KU 77408). x3.] [Illustration: PLATE 5 A B C D E F