Abstract
The two species. Ammocrypta clara Jordan and Meek and Ammo- crypta pellucida (Baird). are shown to be distinct on the basis of scale counts, opercle structure and pigmentation. The original descriptions of these two species were based on syntypes. Lectotypes are designated and described. Specimens of Ammocryta clara Jordan and Meek were collected in Oklahoma for the first time from the Red River south of Bennington. Bryan County, Oklahoma on October 28, 1953. Considerable confusion has existed as to the taxonomic status of this form and the closely re- lated species, Ammocrypta pellucida (Baird). It seemed advisable to examine representatives of these species from various parts of their range to determine their relationship. The original descriptions of these two species are based on syntypes. Dr. E. A. Lachner of the United States National Museum suggested that a lectotype be selected for each species and descriptions published.
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