| Abstract | Three spp. (C. tenuis, asperrimus, and princeps) are discussed with reference to their diagnostic characters, relationships, and distribution. C. tenuis and C. asperrimus are considered allopatric spp. in neighboring drainages. C. princeps appears not to be closely related to any American spp. Nomenclatural and distributional notes are presented for 4 additional spp. (klamathensis, aleuticus, gulosus and asper), and diagnostic characters are treated. C. macrops(-C. klamathensis); C. protrusus (= C. aleuticus), and C. shasta (= C. gulosus). Cottopsis parvus (= C. asper) and Uranidea semiscabra centropleura is aligned with C. gulosus. Problems in methodology in counting fin rays are mentioned and the significance of other characters is considered in the light of ecological and geographic variation. A key to the spp. and a section on zoogeographical implications are included. || ABSTRACT AUTHORS: C. R. Robins
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