Abstract:Lathrostizus shenyangensis, sp. nov. (Figs. 1-6)The new species is similar to L. lugens (Grav.) and L. flexicauda (Holm.),but it can be distinguished from L. lugens by the characters: Clypeus nearly flat, antenna 30 segments, postpectal carina straight or with a very weak notch in the middle and not raised near the notch; from L. flexieauda by the characters: Ovipositor very strongly upcurved, gaster of female mostly redbrown.Holotype: , Shenyang (41.6°N, 122.8°E), Liaoning Prov. 12- V-1992,Xu Gongtian. Paratype: 14, 8, the same data as holotype.Host: The larva of Pteridea sp. was collected from Salix babylonica.The holotype is kept in the General Station of Forest Pests Management,Ministry of Forestry; the paratypes are kept in the above mentioned General Station and Shenyang Administrative Office of Green Planting.