Produced by Chris Curnow, Joseph Cooper, Erica Pfister-Altschul and the Online Distributed Proofreading Team at http://www.pgdp.net UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY Volume 13, No. 7, pp. 323-348, pls. 21-24, 2 figs. February 10, 1961 Geographic Variation In the North American Cyprinid Fish, Hybopsis gracilis BY LEONARD J. OLUND AND FRANK B. CROSS UNIVERSITY OF KANSAS LAWRENCE 1961 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Robert W. Wilson Volume 13, No. 7, pp. 323-348, pls. 21-24, 2 figs. Published February 10, 1961 UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED IN THE STATE PRINTING PLANT TOPEKA, KANSAS 1961 [Illustration] 28-5871 Geographic Variation In the North American Cyprinid Fish, Hybopsis gracilis BY LEONARD J. OLUND AND FRANK B. CROSS CONTENTS PAGE INTRODUCTION 325 METHODS, MATERIALS, AND ACKNOWLEDGMENTS 326 DESCRIPTION OF THE SPECIES HYBOPSIS GRACILIS 327 _Hybopsis gracilis gracilis_ 328 _Hybopsis gracilis gulonella_ 330 INTRASPECIFIC VARIATION 333 NATURAL HISTORY 334 _Habitat_ 334 _Associated Species_ 336 _Food_ 338 _Spawning Season_ 338 DISCUSSION 340 LITERATURE CITED 343 INTRODUCTION