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79 <br />environment similar to that in the upper Yampa River <br />stations (liubbs and Hubbs 1947). <br />Smith (1966) and Hubbs et al (1943) described <br />numerous hybrids between the subgenera Catostomus <br />and Pantosteus. Smith cited hybridization between mem- <br />bers of the former genera as one criterion for the <br />reclassification of the genera into subgenera of the <br />common genus Catostomus. Middleton (1969) found only <br />the intra-subgeneric hybrids longnose sucker (C. catostomus) <br />X white sucker and white sucker X flannelmouth sucker in <br />Blue Mesa Reservoir, Colorado. Coarse-scaled suckers <br />closely resembling the flannelmouth sucker and an atypi- <br />cal form intermediate between the bluehead and white <br />suckers were found in the preimpoundment study of Blue <br />Mesa Reservoir by Wiltzius (1966). The white sucker X <br />flannelmouth sucker hybrids in my study were initially <br />misidentified as "large-scaled" flannelmouth suckers, <br />and the same might have occurred in the Wiltzius study. <br />Wiltzius noted that supposed bluehead suckers from the <br />same area were difficult to identify and lacked notches <br />in the literal aspects of the mouth. A recent sample in <br />the Colorado State University teaching collection, of con- <br />firmed bluehead X longnose hybrids from the upper Colorado <br />River near Grandby, Colorado, shows the same intermediacy <br />of mouth configuration but, as both parents are slender