Another kind of behavior was observed also, in which the female sometimes stopped. The male approached, erecting his fins and arching his body to the left. The female also assumed this arch to the left, and the pair moved in a tight, counter-clockwise circle, with the male on the inside. After a short period in this position, the male moved aside in display, and gyrated to the side and down. Females at both stations moved about slowly, usually remaining in the immediate vicinity of activity by males, and returning to the area even when pursued and deserted some distance away. =Notropis deliciosus= (Girard), sand shiner: Meek (1895:136); Evermann and Cox (1896:402), both as _Notropis blennius_ (Girard); and Jennings (1942:365) as _Notropis deliciosus missuriensis_ (Cope). All stations excepting 1-S, 10-G, 12-G, 17-G, 20-G, 21-G, 22-G, 24-G, 29-G, 30-M, 31-G, 32-G, 33-M, 35-M, 51-M, 55-M, 57-M, 58-G, and 59-G. Nelson (personal communication) has studied the sand shiner in Kansas, and has found that the Big Blue River is an area of intergradation between the southwestern subspecies (_deliciosus_) and the plains subspecies (_missuriensis_). _Notropis d. deliciosus_ prefers cool, rocky habitat, and occurs in small streams of the Flint Hills, whereas _N. d. missuriensis_ occupies the sandy, turbid Big Blue and Little Blue rivers. Intergrades occur most frequently in the Big Blue River, but are found in all habitats. =Notropis topeka= (Gilbert), Topeka shiner: Meek (1895:136); Evermann and Cox (1896:403); and Minckley and Cross (in press). Stations 10-G, 11-G, 12-G, 19-G, 31-G, and 32-G. This species was common locally in the upland streams. Female Topeka shiners stripped easily at Station 11-G on July 8, 1958, and adult _N. topeka_ in high breeding condition were collected at Station 31-G on July 14, 1958. The water temperature at both stations was 77.5 deg.F. Evermann and Cox (1896:403-404) recorded female Topeka shiners "nearly ripe" on June 29, 1893. =Notropis buchanani= Meek, ghost shiner. Stations 3-S and 4-S. Only two specimens of _N. buchanani_ were taken, both on August 14, 1957. These specimens (KU 3833), a female with well-developed ova, and a tuberculate male, were near a sandbar in the main channel. To my knowledge, this is the first published record of the ghost shiner from the Kansas River Basin. Mr. James Booth, State Biological Survey, collected _N. buchanani_ from two stations on Mill Creek, Wabaunsee County, Kansas, 1953. =Hybognathus nuchalis= Agassiz, silvery minnow. Stations 2-S, 3-S, 4-S, 7-G, 8-S, and 16-G. This species was taken sporadically, but sometimes abundantly, in the Big Blue River. At Stations 7-G and 16-G a few young-of-the-year were found. TABLE 2. COMPARISONS OF THREE SERIES OF _HYBOGNATHUS_, 50 SPECIMENS EACH, FROM DIFFERENT STREAM SYSTEMS. TABLE LEGEND: Column A: [=X] = MEAN;, Column B: [sigma] = ONE STANDARD DEVIATION; Column C: 2 [sigma]_{m} = TWO STANDARD ERRORS.