We review the taxonomic status of populations of toads referred to Bufo melanochlorus Cope, 1877, that occur in the wet forests on both Atlantic and Pacific versants of Costa Rica. Populations from Pacific versant of Costa Rica and adjacent Panama are qualitatively diagnosable from all other populations and are described herein as a new species. The taxon B. melanochlorus is restricted to populations in the Atlantic and Montane Slopes and Cordillera Central faunal areas of Costa Rica.
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