Description of a new and redescriptions of two known species of Torymus (Hymenoptera: Torymidae) in Taiwan with a key to Taiwanese species

Torymus flavigastris Matsuo sp. nov. (Hymenoptera: Torymidae) is described as a parasitoid of unidentified gall midges (Diptera: Cecidomyiidae) that induce galls on Litsea acuminata (Blume) Kurata (=Actinodaphne acuminata (Blume) Meisner) (Lauraceae), Machilus pseudolongifolia Hayata (Lauraceae), and Eurya chinensis Robert Brown (Theaceae) in Taiwan. This is the first record of Torymidae associated with gall midges on Lauraceae and Theaceae. Redescriptions of T. aiolomorphi and T. orientalis and a key to species of Torymus known in Taiwan are provided.