Notropis topeka (Gilbert) occurs from Minnesota and South Dakota south through Iowa, Nebraska, Kansas, and (Moore, 1957:134). Compared with distributions of other plains fishes, this range is small. No other fish has a similar area of distribution. In Kansas, N. topeka has been reported from scattered localities that indicate its presence throughout the northern part of the state (Kansas River Basin) and in part of the Arkansas River Basin in south-central (Fig. 1). Approximately 37 localities are represented, 10 of which are west of 970 longitude. Nine of the 10 western records were obtained between 1882 and 1887 when the first general surveys of fishes were made in (Gilbert, 1885:98, 1886:210, 1889:39; Cragin, 1885:108; Evermann and Fordice, 1886: 185; Hay, 1888:245, 248, 251, 252 [as Notropis aeneolus Hay], 246). The tenth record is a single specimen (KU 3108) obtained by A. B. Leonard and A. B. Williams from Cherry Creek, Cheyenne County, in April, 1947. Other recent collections west of 970 longitude have not included Topeka shiners. Breukelman (1940a) failed to find them in extensive surveys of streams in northwestern Kansas, and in 1958, Cross and B. C. Nelson did not find N. topeka at any of 30 western localities, including all those cited by Gilbert, Cragin, and Hay. In the River Basin east of 970 longitude, N. topeka was reported from three localities between 1882 and 1887 (Gilbert, 1884 [types from Shunganunga Creek, Shawnee County, described as Cliola (Hybopsis) topeka], 1886:210; Graham, 1885:73). Graham's record may be erroneous, because it evidently was based on the same collection from the Missouri River that was reported by Jordan and Meek (1886:12-14), who did not list the Topeka shiner from that locality. Breukelman (1940b: 380), reporting on fish in the University of Museum of Natural History, tabulated 27 specimens from the Kansas [river], and tributaries not otherwise named. Presumably, this record refers to specimens collected by the State Biological Survey in 1912, from Rock Creek, Douglas County. Jennings (1942: 365) listed N. topeka from two localities, one of which is the only record from the Marais des Cygnes System (Missouri River Drainage). Minckley (1956:353-354) reported one additional locality in the Basin. The species is now known from many other streams in the eastern part of the basin, mostly in the Flint Hills Region. All of the older records from the Arkansas River System are west of 970 longitude, except for two specimens (formerly Indiana Uni-