The Systematics of the Frogs of the Hyla Rubra Group in Middle America

''The Systematics of the Frogs of the Hyla Rubra Group in Middle America'' by Juan R. León, published in 1969, is a scientific examination of the taxonomy, distribution, and natural history of the Hyla rubra group of tree frogs. The work synthesizes previous research and presents new findings on species variations and ecology, focusing on their presence from lowland Mexico to Argentina, with the highest diversity in southeastern Brazil. León addresses the lack of published data on these frogs' ecology and life history, providing essential physical descriptions, behavioral data, and anatomical analyses critical for their systematic classification.