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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."
She is almost naked, whereas her sisters are dad in a warm and sumptuous fleece. She has not, like the Apidae, baskets to gather the pollen, nor, in their default, the tuft of the Andrenae, nor the ventral brush of the Gastrilegidae. Her tiny claws must laboriously gather the powder from the calices, which powder she needs must swallow in order to take it back to her lair.
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