Since no accounts comparable to the preceding for _Smilisca baudini_ are available for other hylid frogs, it is meaningless to attempt any discussion dealing with character significance or variation within the Hylidae. There is considerable literature treating bufonids, leptodactylids, ranids, and various Old World genera (see Baldauf, 1955, for a review of these works). Likewise, a comparison at the familial level based on the study of a single species seems inadequate and premature. By way of summary and synoptic description a list of cranial osteological characters of _Smilisca baudini_ is presented. The items selected enable comparison with similar compilations by other workers, and are based in part on my unpublished observations of other hylids. 1. Compared to hylids not having integumentary-cranial co-ossification, the dermal roofing bones of _Smilisca baudini_ are extensive, and the skull is well-ossified internally. In contrast to most casque-headed hylids (those having integumentary-cranial co-ossification), the dermal roofing bones are much less extensive, the dermal sphenethmoid (see Trueb, 1966, p. 563) is absent, and internal ossification is less extensive. 2. The solum nasi is not ossified; the septum nasi is ossified only posteriorly, and the olfactory eminence is supported by the cartilaginous solum nasi and the bony prevomer. 3. The lingual process is absent. There is no palatal cartilage isolated between the premaxillaries. 4. The anterior end of the cavum medium lies anterior to the cavum inferius. 5. The septomaxillary is basically a U-shaped structure and has a dorsal, anteriorly curved, ramus on the lateral branch and a longitudinal loop of bone ventrally. 6. A distinct pars nasalis is absent on the maxillary. 7. A cartilaginous sclera is present. 8. The taenia tecta marginalis and the tectum synoticum are the only roofing cartilages present. 9. The external part of the plectral apparatus (columella) is directed anterolaterally. The pars ascendens plectri is fused with the crista parotica. 10. The pseudobasal process is fused to the otic capsule. 11. The cornu principalis of the hyale fuses with the pseudobasal process. 12. Two acoustic foramina are present. 13. The sphenethmoid and prootic are synchondrotically united. 14. The frontoparietal is separate from the prootic and exoccipital. 15. The prootic and exoccipital are fused. 16. A bursa angularis oris is present. LITERATURE CITED BALDAUF, R. J. 1955. Contributions to the cranial morphology of _Bufo w. woodhousei_ Girard. Texas Jour. Sci., 7(3):275-311. 1958. A procedure for the staining and sectioning of the heads of adult anurans. Texas Jour. Sci., 10(4):448-451. DUELLMAN, W. E. AND L. TRUEB 1966. Neotropical hylid frogs, genus Smilisca. Univ. Kansas Publ., Mus. Nat. Hist., 17:281-375, pls. 1-12.