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And not only will the Osmiae return, through the always open windows, but they will also nidify on the natal spot, if they find something like the necessary conditions.

We know that the Three-horned Osmia prefers to haunt the habitations of the Bees who nidify in populous colonies, such as the Mason-bee of the Sheds and the Hairy-footed Anthophora, in whose nests I have noted similar facts.

We know that the Three-horned Osmia prefers to haunt the habitations of the Bees who nidify in populous colonies, such as the Mason-bee of the Sheds and the Hairy-footed Anthophora.

True, it may be said that the second progeny is due to the mothers who knew the males in autumn and who would be able to nidify twice a year.

And not only will the Osmiae return, through the always open windows, but they will always nidify on the natal spot if they find something like the necessary conditions.