English: 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 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, species,the wood-devouring new Mason-bee, excavated in the maple; natural size.

Fig. 13. Cells of Osmia similla, 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 stuck together probably with saliva.