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.

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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. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.