Abstract
Within the past 15 years, Notropis bairdi has become common throughout the Cimarron River in Oklahoma and Kansas, largely replacing its cognate species N. girardi. Apart from the Cimarron neither N. girardi nor N. bairdi has been found recently in the Arkansas River basin in western Kansas. Reduced especially in summer when N. girardi needs high flows for reproduction, probably account for depletion of N. girardi in the upper Arkansas mainstream. Notropis bairdi Hubbs and Ortenburger, formerly endemic to the Red 'River Basin in Oklahoma and Texas, now seems firmly established in the Cimarron ~iver drainage oLthe Arkansas River basin. Following initial capture of the species in 1976 by Marshall (1978), in Logan County, Okla
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