The papers in this volume represent revised versions of presentations made at the First Workshop on Yuman Languages held at the University of California, San Diego, June 17-21, 1975. The focus was on the area of syntax, where the least amount of published information had previously been available. Papers presented were: "Syntactic Diversity in Diegueno Dialects" (M. Langdon); "Diegueno Case Marking: Conditions of Optionality" (L. Gorbet); "The Cocopa Auxiliary Verb ya., 'be located,''happen'" (J. M. Crawford); "Oblique and Non-Oblique Surface Case in Kiliwa Syntax" (M. Mixco); "Yuman '*t'" (D. Crook); "The Reduction of idu: 'be' in Mohave" (J. C. Crawford); "Mojave Modals" (P. Munro); "The 'Say' Auxiliary in Maricopa: Some Notes and Speculations" (H. Harwell); "'Not,' in Yuman, I Say" (C. Slater); "Kwtsaan 'lyvii' as an Enclitic" (S. Norwood); "Internal and External Heads in Kwtsaan Relative Clauses" (B. Sundheim); "Havasupai Comparatives" (E. Kozlowski); "Yavpe Irrealis Constructions" (M. Kendall); "Compound Tense Markers in Tolkapaya" (S. Chung); "No More Schwa for Yavapai" (A. Shaterian); "Notes on Walapai Syntax: (J. Redden); "Some Notes on Paipai Object Order and Object-Marking" (J. Joel); and "Notes on the Interpretation of /-m/ and /-k/ in Walapai" (A. Yamamoto). (Author/CFM)