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Twenty-three species of Tetrastichinae (Chalcidoidea, Eulophidae) in the genera Aprostocetus , Sigmophora and Quadrastichus are reported as parasitoids of gall-inducing Cecidomyiidae (Diptera) from collections mainly from Kent, England. Information on hosts, emergence periods and the sex ratio are given for each species.
M.T. Jennings (Fri,) studied this question.
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