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150 The Southwestern Naturalist vol. 36, no. 1 1: <br />i THE SOUTHWESTERN NATURALIST . <br />River system: present and future (W. H. Miller et <br />al., eds.). Amer. Fish. Soc., Bethesda, Maryland, <br />131 pp. <br />UNITED STATES DEPARTMENT OF THE INTERIOR. 1974. <br />Endangered and threatened wildlife and plants; an- <br />imal notice of review. Fed. Register, 39(3):III-75A. <br />1990. Endangered and threatened wildlife <br />and plants; proposal to determine the razorback <br />sucker (Xyrauchen texanus) to be an endangered <br />species. Fed. Register, 55:21154-21161. <br />199 <br />The 1991 annual meeting of the <br />of Texas at El Paso, El Paso, Texa <br />University of Texas at El Paso anc <br />Johnson (respectively) will serve as <br />PUBLICATION <br />Publication dates for each issue <br />follows: <br />34(1) 11 April 1989 <br />34(2) 27 June 1989 <br />34(3) 15 September 19 <br />34(4) 2 January 199E