A Review of the Middle American Tree Frogs of the Genus Ptychohyla by William Edward Duellman is an in-depth taxonomic and ecological study of tree frogs within the genus Ptychohyla, a group native to Central America, particularly the highlands of Mexico and Guatemala. In this review, Duellman aims to clarify the taxonomy, distribution, and ecological behavior of these species, offering a thorough revision of the genus.The study begins with an introduction to the genus Ptychohyla, describing its distinguishing characteristics, such as the unique glandular skin, the presence of enlarged toe discs (which aid in climbing), and their typically colorful appearance. Duellman provides detailed morphological descriptions of the frogs, examining key features like coloration, size, limb structure, and vocalization patterns, all of which are important for species identification.