Two new species of Tenthredo fortunei group (Hymenoptera,Tenthredinidae) from China with a key to subgroups and known species of nigricornis subgroup

Two new species of the nigricornis subgroup of Tenthredo fortunei group from China are described: Tenthredo plagionotella sp. nov. and T. zhoui sp. nov. The diagnosis of Tenthredo fortunei group is briefly discussed. A key to the subgroups of the Tenthredo fortunei group and the known species of nigricornis subgroup is provided.