  We present deep (V ~= 27) V- and I-band stellar photometry of G302 and G312,
two globular star clusters in the halo of M31. These data were obtained using
the Hubble Space Telescope's Wide Field/Planetary Camera 2. We find iron
abundances of [Fe/H] = -1.85 +/- 0.12 for G302 and [Fe/H] = -0.56 +/- 0.03 for
G312, consistent with spectroscopic measurements. The color-magnitude diagrams
for each cluster show no evidence for an intermediate-aged population of stars,
or a second parameter effect in the morphology of the horizontal branch. G302
shows no evidence for a color gradient but the inner regions of G312 are bluer
than the outer regions. G312 shows no evidence of ellipticity or an extended
halo of unbound stars. G302 has a projected ellipticity of 0.195 +/- 0.012 with
the projected major axis oriented towards the center of M31. G302 also shows
evidence of an extended asymmetric stellar halo extending to at least twice the
fitted Michie-King tidal radius. The amount of mass beyond the tidal radius of
G302 is consistent with the stellar escape rates which have been predicted by
N-body simulations of globular clusters in the Galactic tidal field.
