Appearance
Their length varies from 10 to 15 mm. Adults are on wing from March to June.
Reproduction
"O. cornuta" is also known as the builder bee, because when they build their nests in either the ground or structures that allow them to lay their eggs, usually the female digs to find an adequate nest. They build them with debris they have found in their habitat. They store pollen and for the larvae so they can feed themselves as they are left to fend for themselves. Once the larvae are in their adult form, they dig their way out of the nests and begin their adult lives as solitary bees.References:
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