And, further, we learn from the interesting observations of M. Fabre on the Osmiae, which are wild and olitary bees of the Gastrilegidae family, that not only does the Osmia know in advance the sex of the egg she will lay, but that this sex is "optional for the mother, who decides it in accordance with the space of which she disposes; this space being often governed by chance and not to be modified; and she will deposit a male egg here and a female there."
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