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i 384 Robert Rush Miller of deep holes in the Mimbres River a local informant told Dr. Hubb es) that in the 1880's such holes (frequented elsewhere were numerous, that the stream had a more reliable and constant flow, and that he caught many 6-inch "Gila trout," the local name of this species. The terminus of the Mimbres was described in the 1850's as comprising pools or lagoons, surrounded by willow thickets, and 4 to 6 miles above it was up to 21/2 feet deep and flowing at (during summer) 21/2 miles per hour (Antisell,1857, p.176) . Gila4 mohavensis (Snyder), Mohave chub.--This fish is endan- gered.because its numbers, over almost all of its natural range in the Mohave River, California (Fig. 1), have been severely reduced by hybridization and competition with an introduced minnow, G. orcutti (Hubbs and Miller, 1943, 1948, p. 41). The species forms a pure and large population at only one locality in the basin, a spring-fed arti- ficial pond, the site of a health resort, on the western side of Soda (Dry) Lake; it was abundant thereon July 1, 1959. An attempt to establish this fish in other suitable but fishless waters was made in. 1939 and 1940, and although the introduction was initially a success in Sentenac Canyon (San Diego County, California) the population died out there between 1957 and 1959. How long it will continue to persist in the Mohave River basin is problematical. Lepidomeda vittata Cope, Little Colorado spinedace.-This spe- cies, endemic to the upper part of the Little Colorado River, Arizona, has been collected only 3 times since 1873--once in 1938 and twice in 1939. It belongs to a unique, small group of New World minnows, con- fined to the Colorado River system, that are peculiar in having spinose dorsal and pelvic rays (Miller and Hubbs, 1960). Whether the species still persists, in the face of competition with introduced species and modification of its environment, is questionable (reser- voirs have been built and fish toxin used in the main river since 1939; see Hemphill, 1954). Since this statement was written, extensive ef- forts to collect this fish during August 1960 resulted in the capture of but a single specimen in Clear Creek, a tributary of the Little Colo- rado River. Catostomus microps Rutter, Modoc sucker.-This species was de- 'The reference of this species to Gila rather than to Siphateles results from unpublished studies of the comparative ostedogY of the genus Gila and its rela- tives by Teruya Uyeno (PhD. thesis, 1960, Univ. of Mich.). He regards Sipha- teles as a synonym of Gila, 9 viewpoint with which I agree. i