In the upper Neosho basin, Cross (1954a:310) took N. volucellus but not N. buchanani. Other collections have shown N. buchanani to be abundant in the lower Neosho River in Kansas. Moore and Paden (1950:85) observe that N. buchanani was found only near the mouth of the Illinois River in Oklahoma and was sharply segregated ecologically from N. volucellus that occupied a niche in the clear main channels in contrast to the more sluggish waters inhabited by N. buchanani.
Notropis camurus (Jordan and Meek): Stations C-3, C-4, C-5, C-6, C-7, C-8, C-9, C-10, C-11, C-12, C-13, E-1, E-5 (C-131).
Highest concentrations of the bluntface shiner were found close to the mouths of two tributaries of Big Caney River: Rock Creek and Otter Creek. On Rock Creek (Station C-4) this shiner was abundant in a shallow pool below a riffle where water was flowing rapidly. Many large males in breeding condition were taken (June 3). The species formed 20.2 per cent of the fish taken.
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.