Stejneger, L. 1906. A new tree toad from Costa Rica. Proc. U. S. Natl. Mus., 30:817-818. June 4. Stuart, L. C. 1935. A contribution to a knowledge of the herpetology of a portion of the savanna region of central Petén, Guatemala. Misc. Publ. Mus. Zool., Univ. Michigan, 29:1-56, pls. 1-4. October 4. Taylor, E. H. 1952. The frogs and toads of Costa Rica. Univ. Kansas Sci. Bull., 35-577-942. July 1. _Transmitted July 11, 1967._ Transcriber's Notes This file was derived from scanned images. With the exception of the list of typographical errors that were corrected below, the original text is presented. In the copy of the original, the Plate text contains the notation "X 2" after the caption to let the reader know that the image was enlarged by a factor of two. Emphasis Notation _Text_ = Italic +Text+ = Bold Typographical Errors Corrected: Several minor typographical corrections were made (missing periods, commas, incomplete italicization, etc.); but are not indicated here. More substantial changes are listed below: Page 533 - UMZ => UMMZ Page 534 - Diganosis => Diagnosis Page 544 - fontanells => fontanelle Page 545 - prrimary => primary Page 547 - band of of frequencies => band of frequencies Page 550 - ad => had Page 551 - clumbs => clumps Page 552 - acount => account Page 557 - Minchigan => Michigan