=_Notropis venustus venustus_ × _Notropis whipplei_=: KU 3516 (a male, 47.8 mm. in standard length), from Arkansas, Sevier Co., Winters Creek where it is crossed by U. S. Highway 71, 5 mi. N of Little River Bridge, March 8, 1956. Compared in Table 5 with four specimens of _N. whipplei_, KU 3517 (45.0-52.6 mm. in standard length, mean 50.6 mm.), same locality and date as KU 3516; four specimens of _N. v. venustus_, KU 3510 (44.5-49.6 mm. in standard length, mean 47.3 mm.), Louisiana, Winn Parish, Little Naches Bayou on U. S. Highway 71, 8.8 mi. NW Montgomery, March 4, 1956; three specimens of _Notropis lutrensis_ (Baird and Girard) × _N. v. venustus_, KU 3510 (43.3-47.3 mm. in standard length, mean 44.7 mm.), same locality and date as _N. v. venustus_ above; and with tabulated data on _N. v. venustus_ from Gibbs (1957a:185-186). All specimens are from the lower Red River Drainage; other series of _N. whipplei_, _N. venustus_, and _N. lutrensis_ × _N. venustus_, from the Red River Drainage and elsewhere, were examined but are not tabulated because of differences in size, and because of geographic variability that has been discussed by Gibbs (1957a). The Subgenus _Cyprinella_ of _Notropis_, to which _N. venustus_ and _N. whipplei_ belong, has been studied intensively by Gibbs (1957a and b). _Notropis venustus_ differs conspicuously from _N. whipplei_ in having a large dark basicaudal spot; also, _N. venustus_ usually has 8 (rather than 9) anal rays, and 15 (rather than 13) scales above the lateral line immediately anterior to the dorsal fin. Specimens of _N. v. venustus_ from the Red River Drainage, where the most robust representatives of the species are found, differ from _N. whipplei_ in depth of head, body, and caudal peduncle (Table 5). KU 3516 has a composite of the 9-rayed anal fin of _N. whipplei_ and the caudal spot (albeit diffuse) of _N. venustus_; and, the hybrid is intermediate in body-proportions that distinguish the two species, especially depth of head, body, and caudal peduncle. In other features KU 3516 has values within the overlapping ranges of variation of _whipplei_ and _venustus_ except that the ratio of postdorsal length to standard length is extremely long in the hybrid, and the ratio of prepelvic length to standard length is extremely short (Table 5). Both extreme values for the hybrid seem to result from the cumulative influence of characters in which the parental species differ slightly in mean value (especially head-length, in which the hybrid is like _whipplei_, and caudal peduncle-length, in which the hybrid approaches _venustus_, despite the 9-rayed anal fin of the hybrid). The basicaudal spot of the hybrid is like that of _N. v. venustus_ except for being less intense.