Hubbs and Lagler (1947:50) stated that the river carpsucker was "Mostly confined to large silty rivers." Of the stations listed above C-3 least fits this description being a large shallow pool about 1/3 acre in area having bedrock bottom and slightly turbid water. The other stations conform to conditions described by Hubbs and Lagler (_loc. cit._). #Carpiodes velifer# (Rafinesque): SBS. Three specimens of the highfin carpsucker (K. U. 177-179) were collected on July 11, 1912, from an unspecified location on Elk River in Elk County. #Ictiobus bubalus# (Rafinesque): Stations W-3, G-1, G-2, C-1, C-3, C-4, C-6, E-1, E-2, E-3. The smallmouth buffalo shared the downstream proclivities of the river carpsucker. In half of the collections (G-2, C-1, E-1, E-2, E-3) only large juveniles were taken; in the other half only young-of-the-year were found. In one pool at station C-1 hundreds of young buffalo and gar were observed. This large shallow pool was 100 x 150 feet, with an average depth of 8 inches. The bottom consisted of bedrock. Station C-6 was a small pool with bedrock bottom, eight feet in diameter, with an average depth of only 4 inches. Station E-3 was also a small isolated pool with bedrock bottom and an average depth of 6 inches. #Ictiobus niger# (Rafinesque): Station C-5. Only two specimens of the black buffalo were taken. An adult was caught on spinning tackle, with doughballs for bait. The second specimen was a juvenile taken by seining one mile below Station C-5 on September 22. #Ictiobus cyprinella# (Valenciennes): Station G-2. Two juvenal bigmouth buffalo were taken in a shallow pool, along with several juvenal smallmouth buffalo. #Moxostoma aureolum pisolabrum# Trautman and #Moxostoma carinatum# (Cope): SBS. Two specimens of _Moxostoma aureolum pisolabrum_ (K. U. 242-243) and one specimen of _Moxostoma carinatum_ (K. U. 223) were taken from an unspecified locality on Elk River in Elk County on July 11, 1912. There are no other records for any of these fish in the collection area. _M. aureolum pisolabrum_ has been taken in recent years in eastern Kansas (Trautman, 1951:3) and has been found as far west as the Chikaskia drainage in northern Oklahoma by Moore and Buck (1953:21). That occasional northern redhorse enter the larger rivers of the area here reported on seems probable. _M. carinatum_ has been reported only a few times from Kansas. The only recent records are from the Verdigris River (Schelske, 1957:39). Elkins (1954:28) took four specimens of _M. carinatum_ from cutoff pools on Salt Creek in Osage County, Oklahoma, in 1954. This recent record suggests that occurrences in southern Kansas are probable. #Moxostoma erythrurum# (Rafinesque): Stations G-5, G-7, G-10, G-12, C-4, C-5, C-6, C-8, C-10, C-11, C-12, C-13, C-15, E-1, E-2, E-4 (C-131, C-133, C-136).