  We find that a tetragonal CaBe_2Ge_2-type structure can be stabilized in
non-stoichiometric LaPt_{2-x}Ge_{2+x}. We further discovered that tetragonal
LaPt_{2-x}Ge_{2+x} with x=0.15 and 0.2 respectively superconduct at Tc=1.85 K
and 1.95 K, which is about four time higher than that in monoclinic LaPt_2Ge_2.
