At station W-1 the plains shiner constituted 20 per cent of the fish taken. The river was flowing rapidly with large volume at the time of this collection, and all specimens were taken near the bank in comparatively quiet water over gravel bottom. At station W-3, below Tunnel Mill Dam at Winfield, _N. percobromus_ comprised 18.7 per cent of the fish taken, second only to _Lepomis humilis_ in relative abundance. Immediately below the west end of the dam, plains shiners were so concentrated that fifty or more were taken in one haul of a four-foot nylon net. The amount of water overflowing the dam at this point was slight. Water was shallow (8-12 inches) and the bottom consisted of the pitted apron or of fine gravel. At the east end of the dam where water was deeper (1-3 feet) and the flow over the dam greater, large numbers of _Lepomis humilis_ were taken while _N. percobromus_ was rare. In the Arkansas River smaller relative numbers of this shiner were obtained. At station A-2, it formed 4.68 per cent of the total. At this station _N. percobromus_ was taken with _N. lutrensis_ in water about 18 inches deep next to a bank where the current was sluggish and tangled roots and detritus offered some shelter. At station G-1 on Grouse Creek the plains shiner made up 7.68 per cent of the fish taken. The habitat consisted of intermittent pools with rubble bottoms at this station, which was four miles upstream from the mouth of the creek. The plains shiner seems rarely to ascend the upland streams of the area. #Notropis rubellus# (Agassiz): Stations C-3, C-5, C-6, C-7, C-8, C-10, C-11, C-12, C-13, C-14 (J&J). No fish in these collections showed a more persistent preference than _Notropis rubellus_ for clear, cool streams. All collections of the rosyface shiner were in the Big Caney River system, but at only four stations in this system was it common. At station C-11 the highest relative numbers (10.6 per cent) were obtained. This site possessed the most limpid water of any station on the mainstream of Big Caney. Aquatic plants (_Myriophyllum heterophyllum_ and _Potamogeton nodosus_) were common. Other fishes that flourished at this station were _N. boops_, _N. camurus_, _Campostoma anomalum_, and _Etheostoma spectabile_. The water temperature was 86 deg. at surface and 80 deg. at bottom whereas air temperature was 97 deg.. _N. rubellus_ was common at all stations in Otter Creek, the clear, upland character of which has been discussed. In May and June only adults were found. On September 1, examination of several pools in upper Otter Creek revealed numerous young-of-the-year in small spring-fed pools.