On Otter Creek (Station C-13) the species was common in shallow bedrock pools below riffles. It formed 12.1 per cent of the fish taken. At station C-5, _N. camurus_ was characteristically found in an area of shallow pools and riffles. At station C-10 it was found in clear flowing water over rubble bottom and in small coves over mud bottom. At C-11 (July 26) _N. camurus_ was taken only in one small pool with rapidly flowing water below a riffle. In this pool _N. camurus_ was the dominant fish. At station C-12, on April 2, _N. camurus_ was abundant in the stream, which was then clear and flowing. On August 24, it was not taken from the same pool, which was then turbid and drying. The frequent occurrence of this species in clear, flowing water seems significant. Cross (1954a:309) notes that the bluntface shiner prefers moderately fast, clear water. Hall (1952:57) found _N. camurus_ only in upland tributaries east of Grand River and not in lowland tributaries west of the river. Moore and Buck (1953:22) took this species in the Chikaskia River, which was at that time a clear, flowing stream. They noted that in Oklahoma it seems to be found only in relatively clear water. _N. camurus_ did not seem to ascend the smaller tributaries of Big Caney River as did _N. rubellus_ and _N. boops_ even when these tributaries were flowing. #Notropis deliciosus missuriensis# (Cope): Stations A-1, A-2, A-3, W-1, W-2, W-3 (C-136). Sand shiners seemed to be abundant in the Arkansas River, rare in the Walnut River and absent from other streams surveyed. This shiner was most abundant in shallow, flowing water in the Arkansas River; in backwaters, where _Gambusia affinis_ prevailed, _N. deliciosus_ formed only a small percentage of the fish population. #Notropis girardi# Hubbs and Ortenburger: Stations A-2 and A-3. At station A-2 the Arkansas River shiner made up 14.6 per cent of all fish taken. At A-2, it was found only in rapidly-flowing water over clean sand in the main channels. It was absent from the shallow, slowly-flowing water where _N. deliciosus missuriensis_ was abundant. At A-3 _N. girardi_ made up 22 per cent of the total catch, and again preferred the deeper, faster water over clean-swept sand. Failure to find _N. girardi_ at station A-1 is not understood. Females were gravid in both collections (August 25 and 27). In neither collection were young-of-the-year taken. Moore (1944:210) has suggested that _N. girardi_ requires periods of high water and turbidity to spawn. Additional collecting was done at station A-3 on December 22, 1957. A few adults were taken in flowing water but no young were found.