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Acknowledgments.-We are much indebted to Carol Horvitz for serving as courier, to the National Science Foundation for support (BSR8216808 to HMS and RBS), and to Michael Grant, Chairman, Department of E.P.O. Biology, University of Colorado, for provision of facilities. The drawings (Figs. 1 and 2) are by Jan Logan and are modelled after those in Wilson and Meyer's (1971) revision of the taeniata group of Tantilla.
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John B. Iverson (1985) studied this question.
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