Abstract
The exact limitations of Cophura have been a subject of speculation among American workers since Osten Sacken (1886) described the genus. Various writers have added species to the genus with the understanding that it is heterogeneous, including diverse forms. No treatise of relationships has been attempted, probably because of the difficulty of getting together described species. Most of these species are known in literature only by the original descriptions, and limited special collecting in the southwestern States has given the impression that they are rare. Largely due to the success of rather recent collecting, the author has been able to accumulate nearly all the known species and so enabled to make a comprehensive revision.
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