Abstract
The surviving material of C. F. Baker's collection of aphid parasites comprises a total of 107 specimens of which 27 are syntypes representing 9 species described by Baker. Lectotypes are designated for Ephedrus californicus, E. nevadensis, Praon nanus, P. occidentale, Aphidius delicatus, A. coloratus, A. ferruginosus, A. pulcher, and Diaeretiella (= Diaeretus sensu auctt.) californica. The synonymy of all taxa is discussed, and redescriptions of most of the species are given. The remaining 80 specimens of the collection represent 7 genera and 14 species.

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