  We present a comparison of the lithium abundances of stars with and without
planetary-mass companions. New lithium abundances are reported in 79 planet
hosts and 38 stars from a comparison sample. When the Li abundances of planet
host stars are compared with the 157 stars in the sample of field stars of Chen
et al. (2001) we find that the Li abundance distribution is significantly
different, and that there is a possible excess of Li depletion in planet host
stars with effective temperatures in the range 5600--5850 K, whereas we find no
significant differences in the temperature range 5850--6350 K. We have searched
for statistically significant correlations between the Li abundance of parent
stars and various parameters of the planetary companions. We do not find any
strong correlation, although there are may be a hint of a possible gap in the
Li distribution of massive planet host stars.
