Within the _baudini_ group, the skull of _S. cyanosticta_ is the most generalized of the three species; the cranial characters are intermediate between _S. phaeota_ and _S. baudini_. The lateral margins of the skull in _S. cyanosticta_ are gently curved, and have an angularity anterior to the palatine-maxillary suture; the anterior margins are less angular in _S. phaeota_, which has a broader snout. Posteriorly in _S. baudini_ the margins are slightly curved medially, and the greatest width of the skull is between the quadratojugal-maxillary sutures on either side of the skull. The frontoparietals of _S. cyanosticta_ bear slightly irregular lateral margins and a large fontanelle. There is a tendency for obliteration of the fontanelle with increasing age in both _S. baudini_ and _S. cyanosticta_; the lateral margins of the frontoparietals bear large supraorbital flanges in both of these species. In _S. phaeota_ the flanges are most prominent; they extend posterolaterally with straight margins along two-thirds of the length of the orbit and terminate in rather blunt points. The broad interorbital flanges result in a relatively broad external interorbital distance. In _S. baudini_ the flanges are curved posterolaterally around the orbit and terminate in sharp, thin points. The tegmen tympani of all three species are massive. In _S. cyanosticta_ the prooetics slope posteriorly, whereas they slope anteriorly in _S. baudini_ and _S. phaeota_. The skulls of _S. cyanosticta_ and _S. baudini_ are alike in certain respects. The squamosals of both species are large and connected to the maxillary by a bony connection; the squamosals of _S. phaeota_ are large, but extend only two-thirds of the distance from the dorsal end of the quadrate to the maxillary. In _S. baudini_ and _S. cyanosticta_ the nasals are separated throughout their lengths from the ethmoid, whereas the nasals of _S. phaeota_ are separated from the ethmoid by cartilage. The latter separation is due to an incomplete ossification of the nasals in _S. phaeota_. The bony part of each nasal is constricted in the middle of the long axis of the bone, and the nasals are widest anteriorly; posteriorly each nasal bears a medial process, which is narrowly separated from the lateral edge of the ethmoid. Table 5.--Variation in the Number of Teeth in the Species of Smilisca. (All Are Males; N = Number of Jaws, or Twice the Number of Individuals; Means Are Given in Parentheses After the Observed Ranges.)