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The distribution in color and absolute magnitude is presented for 55,158galaxies taken from the Sloan Digital Sky Survey in the redshift range$0.08<z<0.12$, as a function of galaxy number overdensity in a line-of-sightcylinder of transverse radius $1 h^{-1} \mathrm{Mpc}$. In all environments,bulge-dominated galaxies (defined to be those with radial profiles best fitwith large S\'ersic indices) form a narrow, well defined color--magnituderelation. Although the most luminous galaxies reside preferentially in thehighest density regions, there is only a barely detectable variation in thecolor (zero-point) or slope of the color--magnitude relation ($<0.02\mathrm{mag}$ in $^{0.1}[g-r]$ or $[B-V]$). These results constrain variationswith environmental density in the ages or metallicities of typicalbulge-dominated galaxies to be under 20 percent.Comment: submitted to ApJ

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