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The pupa, or chrysalis, we have found in the cells the last of July. It is white, and three-tenths of an inch long. It differs from that of the Leaf-cutter bee in having four spines on the end of the body. In none of the wild bees are the cells constructed with more nicety than those of our little Ceratina.
They were feeding on the masses of pollen, which were as large as a thick kidney bean, and occupied nearly half the cell. The habits and structure of the little green Ceratina ally it closely with Xylocopa. This pretty bee, named Ceratina dupla by Mr. Say, tunnels out the stems of the elder or blackberry, syringa, or any pithy shrub, excavating them often to a depth of six or seven inches.
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