Ninety-one species of sawflies (Hymenoptera: Symphyta) are recorded for Plummers Island, Maryland. Records are from collections during the periods of 1902–1924, 1958–1972, and 2005. An estimated 97 species currently may occur on the Island. Indications are that species composition has changed through the years. Only 22 of the 51 species (43%) collected during 1902–1924 have been collected in subsequent years, and only 26 of the 48 species collected in 2005 (54%) have been collected previously. Records also are given for 20 species of 11 families of Apocrita: 6 species of Aulacidae, 3 of Evaniidae, 1 of Gasteruptiidae, 1 of Heloridae, 1 of Ibaliidae, 1 of Pelecinidae, 1 of Roprionidae, 2 of Rhopalosomatidae, 1 of Stephanidae, 2 of Trigonalidae, and 1 of Vanhorniidae.
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