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This article discusses the speciation of fish and the many factors which may block hybridization and isolating mechanisms which cause segregation. 185. Hubbs, C. L., and E. R. Kuhne. 1937. Anew DISTRIBUTION fish of the genus Apocope from a Wyoming DESCRIPTION warm spring. Occasional Papers, Museum of ENDANG. FISH Zoology, University of Michigan, Ann HABITAT Arbor. No. 341. 21 pp. GREEN R. 6 Original description of a new subspecies of Cyprinid, Apocope oscula thermalis (Rhinichthys osculus thermalis) is provided. This sub- species is unique to Kendall Warm Springs, Wyoming and apparently developed from R. osculus by long physical isolation in the spring and associated short creek draining into the Green River. A description of the habitat and meristic counts and color description are provided. 186. Hubbs, C. L., and R. R. Miller. zation in nature between t Catostomus and Xyrauchen. Academy of Sciences, Arts, 38:207-233. 1953. Hybridi- ENDANG. FISH he fish genera DISTRIBUTION Papers Michigan DESCRIPTION and Letters SPAWNING ABUNDANCE 3, 4, 8 The article mentions the abundance of Xyrauchen in the Colorado and Gunnison rivers in earlier times, from Jordan (1891) and others. Several sources are also mentioned saying razorbacks, at least in more abundant times, migrated up river and into smaller streams *_o spawn. It is suggested that they spawn on gravel riffles with suckers. The hybrids between the flannelmouth and razorback suckers are described and the collections by W. P. Knock in the Colorado and Gunnison rivers are discussed. 187. Hubbs, C., and K. Strawn. 1956. Interfertility FISH between two sympatric fishes, Notropis SPAWNING lutrensis and Notropis venustus. Evolution GENETICS 10(4):341-344. DISTRIBUTION 39, 40 The rednose shiner, Notropis lutrensis (Baird and Girard) and spottail shiner, Notropis venustus (Girard) are among the most abundant fishes in southwestern North America. This 79