Sigmophora tricolor (Ashmead) and Sigmophora sayatamabae (Ishii) (Hymenoptera: Eulophidae) were resurrected from Sigmophora brevicornis (Panzer), on the basis of morphological differences between the first two and the last, although Ikeda (Ins Matsum 55:37-74 1999) had synonymized Tetrastichus tricolor and Tetrastichussayatamabae with S. brevicornis. We then synonymized S. sayatamabae with S. tricolor. Japanese Sigmophora specimens that were reared from Pseudasphondylia neolitseae Yukawa (Diptera: Cecidomyiidae) on Neolitsea sericea (Blume) Koidzumi (Lauraceae), and Asphondylia yushimai Yukawa and Uechi (Diptera: Cecidomyiidae) on Lespedeza bicolor Turczaninow (Fabaceae) were newly identified as S. tricolor. We redescribe S. tricolor because its original description was insufficient for identification. In addition, we describe a new species of Sigmophora that parasitizes Asphondylia morivollera (Naito) on Morus alba Linnaeus (Moraceae) and an unidentified gall midge on Hydrangea serrata (Thunberg) Seringe (Hydrangeaceae) in Japan. Parasitic strategies and annual life history of S. tricolor are discussed.
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