A New Species of Hymenopterous Parasite of the Pea Aphid (Macrosiphum Pisi Kaltenbach)1

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Abstract
During the past five years the writer has noted that certain hymenopterous parasites were responsible for the destruction of large numbers of the pea aphid on peas and alfalfa. The most important of these has previously been recorded2 from M. pisi under the name of Aphidius rosae Haliday. However, after a careful study of the subfamily Aphidiinae (Braconidae: Hymenoptera) the writer believes the Aphidius from the pea aphid is a new species which is quite distinct from Aphidius rosae which is a common parasite of Macrosiphum rosae L. and M. solanifolii Ashmead.