  He II Ly-alpha 304/H-alpha 1640 emission lines are mainly produced by
recombination, and their canonical ratio of about 10 may be a sensitive
reddening indicator. We obtain the high S/N optical spectra of two quasars and
combine them with the far-UV spectra that show the He II 304 emission. For HS
1700+64, the He II 1640 emission is not detected, and an upper limit to it sets
the ratio greater than 20. For Q0302-003, the ratio is very low, on the order
of unity. The most plausible cause for such a low ratio is extinction in the
EUV band by very fine grains of dust. Q0302-003 has a prominent narrow
component of FWHM ~ 2000 km/s in its major emission lines, and it appears that
reddening is associated only with the line-emitting region. We suggest that the
geometry of the line-emitting region in high-z quasars resembles that in the
low-luminosity active galaxies, with the presence of dust mostly in the outer
part.
