5. Amphibians and Reptiles of the Rainforests of Southern El Petén, Guatemala. By William E. Duellman. Pp. 205-249, pls. 7-10, 6 figures in text. October 4, 1963. 6. A revision of snakes of the genus Conophis (Family Colubridae, from Middle America). By John Wellman. Pp. 251-295, 9 figures in text. October 4, 1963. 7. A review of the Middle American tree frogs of the genus Ptychohyla. By William E. Duellman. Pp. 297-349, pls. 11-18, 7 figures in text. October 18, 1963. 8. Natural history of the racer Coluber constrictor. By Henry S. Fitch. Pp. 351-468, pls. 19-22, 20 figures in text. December 30, 1963. 9. A review of the frogs of the Hyla bistincta group. By William E. Duellman. Pp. 469-491, 4 figures in text. March 2, 1964. More numbers will appear in volume 15. TRANSCRIBER'S NOTES With the exception of six typographical errors that were corrected, converting the 6 occurrences of "pp." to "Pp." to match the 95 in the Publication listing and moving the list of Publications to the end of the document, the original text and illustrations are presented as they appeared in the printed version. Although it is common practice to convert text that appears in small caps in the original into all caps in the text version, it was decided that it looked better not to convert all of the text. For example, the Table titles. Emphasis Notation _Text_ - Italic =Text= - Bold Typographical Corrections Page Correction ==== =========================== 585: Myiarchis => Myiarchus 590: insectivorus => insectivorous 611: Vieillot was incorrectly italicized. 619: Oberholser was incorrectly italicized. 624: trailii => traillii 642: in => is