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We present the luminosity function and color-redshift relation of amagnitude-limited sample of 145 mostly red field E/S0 galaxies at z < 1 fromthe DEEP Groth Strip Survey (GSS). Most of the E/S0s (86%) form a red envelopein the redshift-color diagram, consistent with predictions of spectralsynthesis models in which the dominant stellar population is formed atredshifts z > 1.5. Constructing a luminosity function of the full sample of  145 E/S0s, we find that there is about 1.1--1.9 magnitude brightening inrest-frame B band luminosity back to z = 0.8 from z=0, consistent with otherstudies.  Together with the red colors, this brightening favors models in which thebulk of stars in red field E/S0s formed before z_{for} > 1.5 and have beenevolving rather quiescently with few large starbursts since then.  Evolution in the number density of field E/S0 galaxies is harder to measure,and uncertainties in the raw counts and their ratio to local samples mightamount to as much as a factor of two.  Within that uncertainty, the number density of red E/S0s to z = 0.8 seemsrelatively static, being comparable to or perhaps moderately less than that oflocal E/S0s depending on the assumed cosmology. A doubling of E/S0 numberdensity since z = 1 can be ruled out with high confidence (97%) if\Omega_{m}=1.  Taken together, our results are consistent with the hypothesis that themajority of luminous field E/S0s were already in place by z = 1, that the bulkof their stars were already fairly old, and that their number density has notchanged by large amounts since then.

The DEEP Groth Strip Survey. X. Number Density and Luminosity Function of Field E/S0 Galaxies atz< 1