论文信息 - Distribution and phenology of the Ancistrocerus and Symmorphus species in eastern Fennoscandia (Hymenoptera, Eumenidae)¹

Distribution and phenology of the Ancistrocerus and Symmorphus species in eastern Fennoscandia (Hymenoptera, Eumenidae)¹

Distribution and phenology of ten Ancistrocerus and eight Symmorphus species in Finland and the northwestern U.S.S.R. are presented on the basis of 8495 specimens from public and private collections. A. nigricornis, S.fuscipes and S. murarius are shown to have retreated during the last few decades from a large area of their former range in Finland. The proportions of A. antilope, A. parietum, S. allobrogus and S. crassicornis have decreased, while the pro portion of A. parietinus has considerably increased in the area after the year 1970. Decrease of dead deciduous trees is one possible A. parietum in

L. Huldén | A. Pekkarinen

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