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Published online by Cambridge University Press: 31 May 2012
In the course of studies on the insects of rose hips Dr. W. V. Balduf, of the University of Illinois, reared and sent me for identification two species of Opius, both parasites of Rhagoletis alternata (Fall.). These are distinct from all described American species, and so far as I have been able to determine, they are different from all species of Opius known in Europe, where the host also occurs. Accordingty, both are described here as new.