References :
[1] http://www.nhm.ac.uk/entomology/chalcidoids/index.html

[2] Askew, R.R. 1965. The biology of
the British species of the genus Torymus Dalman associated
with galls of Cynipidae on oak, with special reference to alternation
of forms. Transactions of the Society for British Entomology 16:217-232
[3] Askew, R.R. 1966. Observations on
the British species of Megastigmus Dalman (Hym. Torymidae)
which inhabit cynipid oak galls. Entomologist 99:124-128.
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