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until the following spring, when it completes its transfor

mations.

In the economy of our wild bees we see the manifestation of a wonderful instinct, as well as the exhibition of a limited reason. We can scarcely deny to animals a kind of reason which differs only in degree from that of man. Each species works in a sphere limited by physical laws, but within that sphere it is a free agent. They have enough of instinct and reason to direct their lives, and to enable them to act their part in carrying out the plan of creation. To be continued.

EXPLANATION OF PLATE 10.

Fig. 1. A cell of the Humble-bee; natural size, with the pollen mass built upon the top.

Fig. 2. End view of the same cell, showing the three eggs laid in three divisions of the cavity.

Fig. 3. Xylocopa Virginica, the Carpenter Bee.

Fig. 4.

The larva of Xylocopa Virginica, the Carpenter Bee; natural size.

Fig. 5. The nest containing the cells of the same, with the partitions and pollen masses, on which the young larva is seen in the act of feeding; natural size.

Fig. 6. Young larva of Anthrax sinuosa; side view.

Fig. 7. Pupa of Anthrax sinuosa; side view; natural size.

Fig. 8. The Leaf-cutter Bee (Megachile), on a rose-leaf, in the act of cutting out a circular piece.

Fig. 9. Cells of Megachile, in the elder; natural size.

Fig. 10. Larva of Ceratina dupla, the little green upholsterer Bee;

enlarged.

Fig. 11. Cells of the same in the stem of the elder; natural size.
Fig. 12. Cells of Osmia lignivora, new species, the wood-devouring
Mason-bee, excavated in the maple; natural size.
Fig. 13. Cells of Osmia simillima, the common green Mason-bee,
built in the deserted gall of the Oak-gall Fly.

Fig. 14. A single earthen cell of the same; natural size.

Fig. 15. Pollen mass, or bee-bread of Osmia lignaria; natural size. It is made up of distinct pellets of pollen, which are probably stuck together with saliva.

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LANATION OF PLATE 10.

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