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3. An introduction to the natural history of British sawflies;Benson;Trans. Soc. Br. Entomol.,1950
4. Handbooks for the Identification of British Insects: Hymenoptera 2. Symphyta 6, Part 2 (c);Benson,1958
5. Comments on the taxonomy of Symphyta (Hymenoptera) (Preliminary studies for a catalogue of Symphyta, part 4);Blank,1998