INVESTIGATIONS OF THE RELATIONSHIP BETWEEN STELLAR MAGNETIC ACTIVITY AND ROTATION REVEAL THE PRESENCE OF A SATURATION THRESHOLD WHERE FOR UNKNOWN REASONS ACTIVITY NO LONGER VARIES WITH ROTATION PERIOD PROT. HOWEVER THESE STUDIES HAVE FOCUSED ON STARS IN YOUNG OPEN CLUSTERS AND FIELD STARS. MEASURING PROT AND PROXIES FOR MAGNETIC ACTIVITY IN OLDER OPEN CLUSTERS IS ESSENTIAL TO UNDERSTAND THE EVOLUTION OF THE ACTIVITY ROTATION RELATION FROM THE ZAMS TO THE AGE OF FIELD STARS. WE PROPOSE A SNAPSHOT X RAY SURVEY OF K AND M DWARFS WITH MEASURED PROT IN THE 650 MYR OLD HYADES. BY MATCHING THE RESULTING X RAY CATALOG TO OUR CATALOG OF 134 HYADES PROT WE WILL ANALYZE THE BEHAVIOR OF CORONAL ACTIVITY AS A FUNCTION OF ROSSBY NUMBER RO AT 650 MYR.