. The Canadian field-naturalist. Figure 1. Redfin Shiner, Notropis umbratilis. 1985; Smith 1985). Problems identifying speci- mens of this species have been encountered frequently in the United States (Clay 1962; Snelson 1972, 1973; Snelson and Pflieger 1975; Cooper 1983; Robison 1985; Smith 1985). Redfin identification is simpler in Canada because the congeners causing this confusion do not occur in Ontario (Lee et al. 1980). Distribution The Redfin Shiner is endemic to North America: its distribution is restricted primarily to the east- central United States (Figure 2). The western margin of
. The Canadian field-naturalist. Figure 1. Redfin Shiner, Notropis umbratilis. 1985; Smith 1985). Problems identifying speci- mens of this species have been encountered frequently in the United States (Clay 1962; Snelson 1972, 1973; Snelson and Pflieger 1975; Cooper 1983; Robison 1985; Smith 1985). Redfin identification is simpler in Canada because the congeners causing this confusion do not occur in Ontario (Lee et al. 1980). Distribution The Redfin Shiner is endemic to North America: its distribution is restricted primarily to the east- central United States (Figure 2). The western margin of its range extends from eastern Texas and Louisana through eastern Oklahoma, Kansas and Iowa. To the north, it extends along southeastern Minnesota, southern Wisconsin and Michigan to western New York and northwestern Pennsylva- nia. Canadian populations thus occur on the extreme northern fringe of the species' distribu- tion. To the east, the range is bounded by the western portions of West Virginia, Kentucky, Tennessee and Mississippi. Within these boundar- ies, its distribution is continuous. There is no evidence to support Hocuttand Wiley's (1986: 110) claim that the species is native to the St. Lawrence and Ottawa rivers and to Lake Champlain. Other distribution details are outlined elsewhere (Jordon 1877; Forbes and Richardson 1920; Greene 1935; Trautman 1935; Eddy and Surber 1947; Langois 1954; Eddy 1957; Moore 1957; Hubbs and Lagler 1958; Clay 1962; Larimore and Smith 1963; Metcalf 1966; Cross 1967; Scott 1967; Smith-Vaniz 1968; Rancy 1969; Pflieger 1971; Jenkins et al. 1972; Miller and Robison 1973; Scott and Crossman 1973; Douglas 1974; Eddy and Underhill 1974; Cross and Collins 1975; Pflieger 1975; Snelson and Pflieger 1975; Snelson 1980; Hubbs 1982; Becker 1983; Cooper 1983; Smith 1985; Etnier and Starnes in preparation). The species is polytypic (Snelson and Pflieger 1975), the eastern subspecies being designated Notropis umbratilis cyanocephalus (Copeland in Jorda
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