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We present a color analysis of the galaxy populations of candidate clustersof galaxies from the Palomar Distant Cluster Survey (Postman et al.\ 1996). Thesurvey was conducted in two broad band filters that closely match $V$ and $I$and contains a total of 79 candidate clusters of galaxies, covering anestimated redshift range $0.2 \simless z \simless 1.2$. We examine the colorevolution in the 57 richest clusters from this survey. The intermediateredshift ($0.2 \simless z \simless 0.4$) clusters show a distinct locus ofgalaxy colors in the color--magnitude diagram. This ridge line corresponds wellwith the expected no--evolution color of present--day elliptical galaxies atthese redshifts. In clusters at redshifts of $z \simgreat 0.5$, this redenvelope has shifted bluewards compared to the ``no--evolution'' prediction. By$z \sim 0.8$ there are only a few galaxies which are as red in their rest-frameas present--day ellipticals. The detected evolution is consistent with passiveaging of stellar populations formed at redshifts of $z \simgreat 2$. Though theuncertainties are large, the Butcher--Oemler effect is observed in the Palomarclusters. The fraction of blue galaxies increases with the estimated redshiftof the cluster at a 96.2\% confidence level. The measured blue fractions of theintermediate redshift clusters ($f_{b} \sim 0.2 - 0.3$) are consistent withthose found previously by Butcher \& Oemler (1984). The trend in the Palomarclusters suggests that $f_{b}$ can be greater than 0.4 in clusters of galaxiesat redshifts of $z \simgreat 0.6$.Comment: Latex, 28 pages, aaspp.sty, 11 figures and epsf.sty included,  appended as a uuencoded, gzipped tar file, accepted for publication in the  Astronomical Journa

The Palomar Distant Cluster Survey. III. The Colors of the Cluster Galaxy