  We have collected optical follow-up observations from the ground and the
Hubble Space Telescope (HST) for 13.74 square ' of archival images taken with
the Near Infrared Camera and Multi Object Spectrograph (NICMOS). We use two
criteria to select E/S0 galaxy candidates at z>~1 and z>~1.5 (HizECs) based on
colors and infrared morphology. The observed surface density of HizECs is
significantly smaller than what is predicted assuming the local luminosity
function (LF) of E/S0, constant comoving density, and pure passive evolution
with a high redshift of formation of the stellar populations (z>~ 5). On the
other hand, assuming a low redshift (z<~2) of formation, not enough HizECs are
predicted. The data are very well matched assuming that a substantial fraction
of present-day E/S0s (10-66%, depending on cosmology and on the local LF of
E/S0s) formed at z = 3 or higher and then evolved passively. The rest of the
current E/S0 population may have formed at lower redshift, or may have been
rejected by the selection criteria because of interactions or more recent
episodes of star-formation (disturbed morphology and/or bluer colors).
