An updated second edition of “Acridomorph (Orthoptera) species of Argentina and Uruguay/Especies de Acridomorfos (Orthoptera) de Argentina y Uruguay”. Carbonell, C.S., Cigliano M.M. & Lange, C.E. CD-ROM. Publications on Orthopteran Diversity. The Orthopterists’ Society. ISBN 987-05-0546-5 has been updated and released in a new online format version to be used on PC, tablets and cell phones. Names of genera, species, and subspecies have been listed. For each species, the classification, synonyms, geographic distribution, main host plants, economic importance, observations, and the most relevant bibliographical references is given. The species are illustrated with photographs of male and female individuals, and the habitat, when they have been taken in nature. The new version can be explored and/or freely downloaded.