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11-42. Aquatic worms of the family Tubuficidae dominated the mud slide lake fauna. These • crga ni sms are quite tolerant of environmental stress which is probably more pronounced in the mud slide lake than in the upper beaver pond. The upper beaver pond contained a considerably higher abundance and diversity of bottom fauna than did the mud slide lake. The amphipod, Hyalella azteca, and bae tid mayflies dominated the upper beaver pond bottom fauna indicating good water quality. Further evidence of good water quality is presented by the abundance of the amphipod Cammarus Constant inflow of freshwater and nutrients probably contributes to the more favorable environment present in the upper beaver pond than found in the mud slide lake. Literature Cited American Ornithologists' Union. 1957. Checklist of North American birds. Fifth Edition. Port City Press, Baltimore. 691 pp. American Ornithologists' Union. 1973. Thirty-second supplement to the American • Ornithologists' Union Checklist of North American Birds (5th edition, 1957). Auk 90:411-419. American Ornithologists' Union. 1976. Thirty-third supplement to the American Ornithologists' Union Checklist of North American Birds (5th edition, 1957). Auk 93:875-879. Armstrong, D.M. 1972. Distribution of mammals in Colorado. Museum of Natural History, the University of Kansas. Monograph 3. 415 pp. Bailey, A. M. and R.J. Niedra ch. 1965. Birds of Colorado. Vol. I and I1, Denver Mu s. Natu r. Hist. 1175 pp. Berner, L. 1959. A tabular summary of the biology of North American mayfly nymphs (Ephemeroptera ). Bulletin Florida State Museum 4(1):11. Bieniasz, A, 1979, The greater sandhi 11 crane in Routt County, Gol orado. pp. 197-204. In Lewis, F. C. (ed.). 1979. Proceedings 1978 Crand Workshop. Colorado State University Printing Service. Ft. Collins. 259 pp. Bissell, S,J. (ed.). 1978. Colorado mammal distribution lati long study. Colorado Division of Wildlife, Nongame Section. Denver, Colorado. 20 pp. • 30