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<br />~3'2
<br />
<br />Hubbs. and J.l1 iller
<br />
<br />factor, along with the unstable and ephemeral nature of freshwater
<br />habitats, is regarded as a main reason why freshwater fishes hybrid-
<br />ize oftener than do marine fishes.
<br />
<br />LITERATURE CITED
<br />
<br />D :lUGLAS, PHILIP A. 1952. Notes on Spawning Activities of the Humpback Sucker,
<br />Xyrauchen tl'xanus (Abbott). Calif. Fish and Game, 38 (2): 149-55, fig,g. 1-4.
<br />
<br />EI,LIS, MAx M. 1914. Fishes of Colorado. Univ. Colo. Studies, 11: 1-136, 4 figs.,
<br />pis. 1-12. '
<br />
<br />GrLBERT, CHARLES HENRY, AND NORMAN BISHOP SCOFIELD. 1898. Notes on a Col-
<br />lection of Fishes from the Colorado Basin in Arizona. Prolc. U. S. Nat.
<br />Mus., 20: 4,87-99, pis. 86-39.
<br />
<br />GIH.mn, CHARLES. 1859. Ichthyology of the Boundary. U. S. and Mex. Bound.
<br />Surv., 2 (2): 1-85, pIs. 1-41.
<br />
<br />HUBBS, CARL L. 1930. Materials for a Revision of the Catostomid Fishes of Eastern
<br />North America. Misc. Pub!. Mus. Zoo!., Univ. Mich., 20: 1-47.
<br />
<br />-- 1940. Speciation of Fishes. Am. Nat., 74: 198-211 (also in Biological Symposia
<br />[Lancaster, }'a.: Jaques Cattell Press), II, 7-20).
<br />
<br />-.- AND LAURA C. HUBBS. 1947. Natural Hybrids between Two Species of Catos-
<br />tomid Fishe!l. Pap. Mich. Acad. ScL, Arts, and Letters, 31 (1945): 14'7-67,
<br />figs. 1-2.
<br />
<br />-.- - AND RAYMOND E. JOHNSOl.'l". 1948. Hybridization in Nature between Spe-
<br />cies of Catostomid Fishes. Contrib. Lab. Vcrt. Bio!., Univ. Mich., 22: 1-76,
<br />figs. 1-8, pis. 1-7.
<br />
<br />-- AND KARL F. LAGLER. ]947 (2d printing, 1949). Fishes of the Great Lakes
<br />Region. Cmnbrook lnst. Sci., Bull. 26. xi + 186 pp., figs. 1-251, 211 col.
<br />pIs., 1 map.
<br />
<br />-.- AND ROBERT R. MrLLER. 1943. Mass Hybridization between Two Genera of
<br />Cyprinid Fishes in the Mohave Desert, California. Pap. Mieh. Acad. ScL,
<br />Arts, and Letters, 28 (1942): 343-78, figs. 1-2, pis. 1-4.
<br />
<br />_h_ BoYI!- W. WALKER, AND RAYMOND E. JOHNSON. 1943. Hybridization in Na-
<br />ture between Species of American Cyprinodont Fishes. Conbib. Lab. Vert.
<br />Bio!., Univ. Mich., 28: 1-21, pis. 1-6.
<br />
<br />Jm:DAN, DAVID STARR. 1891. Report of Explorations in Colorado and Utah during
<br />the Summer of 1889, with an Account of the Fishes Found in Each.of the
<br />River Basins Examined. Bull. U. S. Fish Comm., 9 (1889): 1-40, pis. 1-5.
<br />
<br />MbLER, ROBERT RUSH. 1946a. The Need for Ichthyological Surveys of the Major
<br />Rivers of Western North America. Science, 104: 517-19.
<br />
<br />-'-1946b. Gila cypha; a Remarkable New Species of Cyprinid Fish from the Colo-
<br />rado River in Grand Canyon, Arizona. Journ.Wash. Acad. ScL, 36: 409-15,
<br />fig. 1.
<br />
<br />
<br />Hybridization between Catostomus and Xyrauchen
<br />
<br />233
<br />
<br />MILLER, ROBERT RUSH, AND RALPH G. MILLER. 1948. The Contribution of the
<br />Columbia River System to the Fish Fauna of Nevada: Five Species Unre-
<br />corded from the State. Copeia, 1948: 174-87, map 1.
<br />
<br />NELSON, EDWARD M. 1948. The Comparative Morphology of the 'Veberian Ap-
<br />paratus of the Catostomidae and Its Significance in Systematics. .Journ.
<br />Morph., 83: 225-51, figs. 1-3, pis. 1-3.
<br />
<br />- 1949. The Opercular Series of the Catostomidae. Ibid., 85: 559-67, figs. 1-2.
<br />
<br />REIGHARD, JACOB. 1920. The Breeding Behavior of Suckers and Minnows. 1.
<br />The Suckers. BioI. Bull., 38: 1-32, figs. 1-7.
<br />
<br />RUTTER, CLOUDSLEY. 1908. The Fishes of the Sacramento-San Joaquin Basin,
<br />with a Study of Their Distribution and Variation. Bull. U. S. Bur. Fish.,
<br />27 (1907): 103-52, figs. 1-4, pI. 6.
<br />
<br />SIMON, JAMES R. 1946. Wyoming Fishes. Wyo. Game and Fish Dept., Bull. 4:
<br />1-129, figs. 1-92, front.
<br />
<br />SNYDER, JOHN OTTERBEIN. 1915. Notes on a Collection of Fishes Made by Edgar
<br />A. Mearns from Rivers Tributary to the Gulf of California. Proc. U. S.
<br />Nat. Mus., 49: 573-86, I fig., pIs. 76-77.
<br />
<br />'V ALLIS, ORTHELLO L. 1951. The Status of the Fish Fauna of the Lake Mead Na-
<br />tional Recreational Area, Arizona-Nevada. Trans. Am. Fish. Soc., 80
<br />(1950): 84-92, fig. 1.
<br />
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