Abstract
As currently defined, the genus Callona Waterhouse, 1840, contains nine species ranging in distribution from southwestern United States to Venezuela. However, the generic distinction between Callona and its closely allied Crioprosopus Audinet-Serville, 1834, is in need of clarification due to descriptions of both genera being based solely on females (monobasic), absence of allotypes from the type species of these genera, and from the sexual dimorphism displayed by several subsequently described species. Also, scarcity of specimens in collections is a confounding factor in making a determination in the assignment of species to either Callona or Crioprosopus.
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