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Updated: June 26, 2025
With respect to the above groups in which the females are conspicuously coloured and build concealed nests, it is not necessary to suppose that each separate species had its nidifying instinct specially modified; but only that the early progenitors of each group were gradually led to build domed or concealed nests, and afterwards transmitted this instinct, together with their bright colours, to their modified descendants.
Old, disused hurdles supplied me with reeds inhabited from end to end by the Horned Osmia. In both cases I obtained the same results and the same conclusions as with the Three-horned Osmia. I return to the latter, nidifying under my eyes in some old nests of the Mason-bee of the Walls, which I had placed within her reach, mixed up with the tubes.
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