Species of the abbotii and erythrogaster groups of Nematus Panzer are revised. The abbotii group includes N. abbotii (Kirby), N. laticulus (Noton), and N. tertius, n. sp. The erythrogaster group includes N. carpini (Marlatt), N. corylus Cresson, N. erythrogaster Norton, N. hamamelis, n. sp., and N. latifasciatus Cresson. Pteronus dyari Marlatt, 1896, is a new synonym of Nematus latifasciatus Cresson, 1880. The species are described, illustrated, and keyed. All occur in eastern North America with two species extending west to Alberta and British Columbia. Host plants are species of Alnus, Betula, Carpinus, Corylus, Ostrya (Corylaceae), Hamamelis (Hamamelidaceae), and Robinia (Fabaceae).
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Vol. 110 • No. 3