The larva and pupa of a gall fly next to a gall fly in natural size and magnified, a cross-section of an infested fruit and a branch of a fruit tree with infested fruit. Engraving by Heath.
- 1 October 1805
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Cynips: the typical genus of the gall flies, hymenopterous insects which puncture plants in order to deposit their eggs, and thus produce galls or gall-nuts