_N. umbratilis_ was a pool-dweller, becoming more concentrated in the deeper pools as summer advanced. In May and early June, large concentrations of adult _N. umbratilis_ were common in the shallow ends of pools together with _N. rubellus_, _N. boops_, _Pimephales notatus_, and _Pimephales tenellus_. By July and August, only young of the year were taken in shallow water, and adults were scarcely in evidence. #Notropis volucellus# (Cope): Stations G-5, G-8, C-3, C-5, C-7, C-8, C-9, C-10, M-1, E-4, E-5. The mimic shiner was a minor element in the fauna, 2.02 per cent at station C-5 being the largest percentage taken. In the Big Caney River system _N. volucellus_ was taken only in the main stream. In the Grouse Creek drainage it was found at two stations in the upper part of the watershed, where water is clearer, gradient greater, and pools well-shaded and cool. In the Elk River the mimic shiner was taken only in the upper part of the main stream. The dominant shiner in situations where _N. volucellus_ was taken was, in all cases, _N. umbratilis_. Elliott (1947) found _N. volucellus_ in Spring Creek, a tributary of Fall River. Farther north in the Flint Hills region, _N. volucellus_ was reported by Cross (1954a:310). #Notemigonus crysoleucas# (Mitchell): Station W-5. This isolated record for the golden shiner consisted of nine specimens collected on June 6 in Timber Creek, a tributary of the Walnut River. Most of the creek was dry. _N. crysoleucas_ was taken in one pool with dimensions of 8 feet by 4 feet with an average depth of 4 inches. This creek is sluggish and silt-laden, even under conditions of favorable precipitation. Hubbs and Ortenburger (1929b:89) observed that the golden shiner prefers sluggish water. Hall (1952:58) took the golden shiner only in the lowland tributaries west of Grand River and not east of the river in upland tributaries. #Phenacobius mirabilis# Girard: Stations W-3, C-3. In no case was the suckermouth minnow common; it never comprised more than 1 per cent of the fish population. #Pimephales notatus# (Rafinesque): Stations W-4, G-5, G-7, G-9, G-12, G-13, B-3, C-1, C-2, C-3, C-4, C-5, C-6, C-7, C-8, C-9, C-10, C-11, C-12, C-13, C-14, C-15, C-16, C-17, C-18, M-1, M-2, E-1, E-2, E-4, E-5, E-7 (J&J, C-131, C-132, C-133). This was much the most abundant of the four species of _Pimephales_ in this area. It was taken at 33 stations as compared with 10 for _P. tenellus_, 8 for _P. promelas_, and 3 for _P. vigilax_. The bluntnose minnow was taken almost everywhere except in the main stream of the Arkansas and Walnut rivers and in lower Grouse Creek. _P. notatus_ seemed to prefer clearer streams of the Flint Hills part of my area. There was a marked increase in percentages taken in the upland tributaries of both Caney River and Grouse Creek. In the Elk River, too, higher concentrations were found upstream.