Pig. E.—Oak apple gall; 2, ditto, section. wearying patience and perseverance, has proved byverycare-fully made experiments that gall flies which had hithertobeen considered as different species, which made very dis- … Fig. P.—1, Marble galls; 2, ditto, section; 3, grub (magnified). should say non-sexual individuals; I shall, however, for thesake of brevity, allude to them as females; while the genera-tion bred from eggs laid in the spring is composed of bothmales and females. The gall flies all resemble one…
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