Amphibians and Reptiles of the Rainforests of Southern El Petén, Guatemala

A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México

A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México

Neotropical Hylid Frogs, Genus Smilisca

A Synopsis of Neotropical Hylid Frogs, Genus Osteocephalus

Systematic Status of the Colubrid Snake, Leptodeira discolor Günther