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threatened and endangered species. Information relative to sexual dimorphism in the adult razorback sucker was acquired through the literature, personal communications, and examina- tion of preserved specimens. 163. Gustafson, E. S. 1975x. Early development, adult sexual dimorphism, and fecundity of the razorback sucker, Xyrauchen texanus, (Abbott). Final report to U. S. Fish and Wildlife Service Contract No. 14-16- 0002-3585. 43 pp. (Abstr.) This report details the development of eggs and larvae from time of fertilization until day 227 for Xyrauchen texanus. It describes 6 sexually dimorphic characteristics for adults and provides the fecundity for five adult females. 164. Gustafson, E. S. 1975b. Preliminary report: states in the embryonic development of the razorback sucker, Xyrauchen texanus. Report to U. S. Fish and Wildlife Service, Albuquerque, New Mexico. 15 pp. (mimeo) The embryological research began in November, 1974. Increases in total length and in pigmen- tation of the embryos from hatching to the late post larval period were noted. Phase I of the project includes determination and documentation of the gross morphology of all embryonic, prolarval, and postlarval stages in the life history of Xyrauchen. 165. Hagan, H. K., and J. E. Banks. 1963. An ecological and limnological study of the Green River in Dinosaur National Monument. Colorado State University and U. S. National Park Service. Contract no. 14-10-0232-686. 31 Fp. Descriptions of fish and aquatic invertebrate sampling in Dinosaur National Monument during the summers of 1961-1962. Two Colorado squaw- fish were collected at Split Mountain in 1962, but none were collected at the Gates of Lodore, Echo Park, Island Park, or Castle Park. The log of Joseph E. Banks is also included. DESCRIPTION. DEVELOPMENT ENDANG. FISH LIFE HISTORY 4 ENDANG. FISH DEVELOPMENT LIFE HISTORY 4 DISTRIBUTION INVERTEBRATES ENDANG. FISH DESCRIPTION GREEN R. 3 70