Edward Yeterian has been named dean of faculty and vice president for academic affairs, effective July 1.     Yeterian, the Audrey Wade Hittinger Katz and Sheldon Toby Katz Distinguished Teaching Professor of Psychology, succeeds Robert L. McArthur, who served as head of the faculty for 10 years.     "I and my colleagues in the administration look forward with great anticipation to working with Ed," said President Bill Cotter. "Bob McArthur has set a very high standard for Colby as dean of the faculty and vice president, and I know he will be extremely helpful to Ed in both the coming months and succeeding years."     Yeterian holds a Ph.D. in physiological-comparative psychology from the University of Connecticut and a postdoctoral degree from Harvard in neuroanatomy and neurology. His research on the brain, particularly in primates, has produced more than 20 publications. He has taught at Colby since 1978.