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Here are the Macrocerae and the Eucerae, whose males are proudly horned; the Dasypodae, who carry an ample brush of bristles on their hind-legs for a reaping implement; the Andrenae, so manyfold in species; the slender-bellied Halicti. If I tried to continue this record of the guests of my thistles, it would muster almost the whole of the honey-yielding tribe.

But when we come to the Panurgi, which are cousins of the Dasypodae, a little ray of light suddenly reveals the birth of a new sentiment in this fortuitous crowd. They collect in the same way as the others, and each one digs its own subterranean chambers; but the entrance is common to all, as also the gallery which leads from the surface of the ground to the different cells.

A thousand experiments that could be made have as yet not even been tried. If the Prosopes, for instance, were imprisoned, and forced to cohabit with their kind, would they, in course of time, overstep the iron barrier of total solitude, and be satisfied to live the common life of the Dasypodae, or to put forth the fraternal effort of the Panurgi?

It halts immediately; and hitherto has not succeeded, among the Xylocopae, in passing beyond this first obscure line of love. Among other Apiens, this groping idea assumes other forms. The Chalicodomae of the out-houses, which are building-bees, the Dasypodae and Halicti, which dig holes in the earth, unite in large colonies to construct their nests.