This represents the first record known to me of the plains carpsucker from Kansas. The specimen (KU 4180), 430 mm. in standard length, has the following characters: lower lip without a median, nipple-like projection; dorsal fin-rays, 25; lateral-line scales, 38; diameter of orbit into distance from anterior nostril to tip of snout, 1.1; body-depth into standard length, 3.3; and head-length into standard length, 3.9. The specimen was taken while shocking a wide, shallow channel, over sand bottom. =Carpiodes carpio carpio= (Rafinesque), river carpsucker: Jennings (1942:364). Stations 1-S, 2-S, 3-S, 4-S, 5-G, 6-S, 7-G, 8-S, 9-G, 11-G, 14-S, 15-S, 18-G, 19-G, 23-G, 25-S, 27-G, 28-G, 30-M, 38-S, 39-S, 41-S, 42-S, 43-S, 44-S, 45-M, 50-S, 52-S, and 53-S. The river carpsucker occurred at most stations on the larger streams, and in many of the smaller tributaries. In smaller streams _C. c. carpio_ frequented the largest pools, in or near the floodplains of larger streams. A marked preference for still water, soft, silty bottoms, and areas with drift or other cover was apparent; however, the species also occurred in open waters with moderate to swift currents. The sizes attained by the river carpsucker at different ages were (averages followed by number of fish in parentheses): I, 1.9 (10); II, 3.9 (5); III, 5.3 (8); IV, 7.7 (5); V, 11.9 (2); VI, 11.6 (7); VII, 12.8 (6); VIII, 13.1 (1); IX, 14.9 (2); X, 15.8 (8); and XI, 17.6 (1). These averages are significantly less than those reported by Buchholz (1957:594) for the river carpsucker in the Des Moines River, Iowa. Examination of the gonads of river carpsucker in summer, 1957, indicated that spawning occurred in late July. Young-of-the-year, averaging 21 mm. in total length, first appeared in my collections on July 30, 1957. =Carpiodes velifer= (Rafinesque), highfin carpsucker: Meek (1895:135); Evermann and Cox (1896:389). The highfin carpsucker was not taken in my survey. Meek (1895:135) reported "this small sucker [_C. velifer_] ... common in Blue River at Crete," characterizing the specimens as having "Dorsal rays, 24 to 30; scales in the lateral-line, 36 to 41; head 31/2 to 4; and depth 21/2 to 3." The ranges in the number of dorsal rays and the number of scales in the lateral-line are higher than usual in _C. velifer_, or in _C. c. carpio_, which is now common in the Big Blue River Basin. Both species normally have 33 to 37 lateral-line scales and 27 or fewer dorsal rays (Bailey, 1956:352-353; Moore, 1957:79; and Trautman, 1957:81-82). The other characters listed by Meek would fit the young and some adults of either species, or possibly a composite including _C. forbesi_.